Earth-199999/References to broader MCU

Captain America: The First Avenger

 * Tønsberg, Norway is the same place where the war between the Asgardians and the Frost Giants took place in the beginning of Thor.
 * Johann Schmidt references Odin's chamber moments after taking the Tesseract is Asgardian in origin.
 * Howard Stark is the father of Tony Stark.
 * The Stark Expo theme introduced in Iron Man 2 ("Make Way for Tomorrow Today") is heard after Howard Stark's presentation at the 1942 World's Fair.
 * Stark presents an early version of the repulsor technology that his son would perfect in Iron Man.
 * When Steve Rogers is injected with the Super Soldier Serum, the film cuts to a close up of his eyes opening wide, a shot better known in association with the transformation of the Hulk. The film The Incredible Hulk ties Bruce Banner's gamma ray research into trying to re-create the super soldier serum, (Banner's experiment went wrong, which resulted in Banner's first Hulk transformation) which was destroyed here.
 * Consistent with the serum seen in The Incredible Hulk, it is blue in color and is activated by Vita-rays. The canister containing the serum in The Incredible Hulk was labeled with a Vita-ray radiation warning.
 * Tony Stark had a Captain America shield prototype in his lab in the two Iron Man movies. Stark's father, Howard, is depicted here designing the shield and Captain America's armor. Obadiah Stane also mentions in Iron Man that Tony's father worked on the Manhattan Project, which ties into his World War II activities depicted here.
 * When the Red Skull is seemingly destroyed by the Tesseract, he appears to be transported across space rather than destroyed, shooting into what seems to be Yggdrasil mentioned in Thor.
 * The Asgardians, referred to as "gods", are mentioned.

Marvel One-Shot: Agent Carter

 * The short uses scenes directly from Captain America: The First Avenger.

Iron Man

 * Nick Fury makes an appearance after the credits, discussing the Avengers Initiative.
 * When Tony was taking off his suit in the background, Captain America's shield can be seen. Howard Stark, Tony's father, designed the shield in Captain America: The First Avenger.
 * Obadiah Stane mentions that Tony's father worked on the Manhattan Project, which ties into his World War II activities depicted in Captain America: The First Avenger.
 * In the climatic fight scene, you can see the Roxxon Energy Corporation building behind Iron Monger when he shoots Iron Man with his back rocket.

Iron Man 2

 * Natasha Romanoff appears as an agent of S.H.I.E.L.D.
 * As Nick Fury debriefs Tony near the end of the film, the television screen on the right shows a news report of a destructive aftermath on a university campus. This is the same news report of the Culver University battle caused by the Hulk that was featured midway in the film The Incredible Hulk, indicating that the last moments of Iron Man 2 are concurrent with the events of the later film.
 * On the other maps, you can see points that are related to Hulk, Thor, Captain America and Black Panther, confirmed by Jon Favreau.
 * When Phil Coulson was looking around Tony's workshop he finds a familiar, incomplete shield in a crate. It's heavily hinted to be either Captain America's actual shield or a prototype of it. It was previously featured midway in Iron Man. Howard Stark, Tony's father, designed the shield in Captain America: The First Avenger. Since Captain America's actual shield was trapped with him in the ice, Stark's would have to have been an advanced prototype.
 * The new element Tony creates is the metal the Cosmic Cube is composed of, which is studied by Howard Stark after finding it in Captain America: The First Avenger.
 * In New Mexico, Phil Coulson finds Mjölnir, the weapon used by Thor, in a crater.
 * Nick Fury mentions problems in the Southwest region which is where Mjölnir was lying.
 * Tony Stark looks at a folder and has "Avengers Initiative" printed on it, again a reference to his upcoming participation with the Avengers.
 * Wakanda is shown on a map.

The Incredible Hulk

 * Nick Fury and Rick Jones names are seen in the intro.
 * Stark Industries logo is also seen in the intro showing they created the Sonic Cannons used later and it is also on the Cyrosync container containing the Super Soldier Serum.
 * The S.H.I.E.L.D. logo is seen in the intro, it's again seen when Bruce Banner is being tracked down in New York.
 * General Ross talks about a program in World War II to create Super Soldiers with the Super Soldier Serum which is obviously referring to the creation of Captain America depicted in Captain America: The First Avenger.
 * When General Ross first takes the Super Soldier Serum out of its Cyrosync container, the label on the container says it was developed by Dr. Reinstein, the alias of Abraham Erskine. The label also says the program was called Weapons Plus. The serum is blue, as it is in Captain America: The First Avenger, and the canister is labeled with a warning about Vita-rays, the radiation type used to activate the serum later in the film.
 * When General Ross is sitting in a bar, Tony Stark appears and talks to him about The Avengers. The circumstances leading to Stark's arrival are revealed in Iron Man 2 and the Marvel One-Shot The Consultant from the Thor Blu-ray. During this scene Tony says That Super Soldier program was put on ice for a reason. This is obvious reference to Captain America who was frozen in ice for almost 70 years.

A Funny Thing Happened on the Way to Thor's Hammer

 * The Roxxon logo is seen.

Thor

 * The prologue takes place in Tonsberg, Norway. It is believed that during this time the Asgardians gave or lost the Tesseract to the Earth. Tonsberg is shown early in Captain America: The First Avenger when Johann Schmidt aquires the cube.
 * Mjölnir was shown in the post-credits sequence of Iron Man 2, a scene that appeared once again in Thor.
 * Clark Gregg returns as S.H.I.E.L.D. agent Phil Coulson, who previously appeared in Iron Man and Iron Man 2.
 * Erik Selvig references Bruce Banner's gamma incident.
 * Kevin Feige has confirmed that the "friend" Erik Selvig plans to email is Henry Pym.
 * Clint Barton appears as an agent of S.H.I.E.L.D.
 * Thor temporarily goes under the alias Donald Blake.
 * When The Destroyer arrives on Earth, Jasper Sitwell asks "Is that one of Stark's?" to which Phil Coulson replies "I don't know... the guy never tells me anything".
 * Thor makes it clear that S.H.I.E.L.D. can consider him an ally.
 * Erik Selvig has a conversation with Nick Fury after the credits.
 * Nick Fury shows Selvig a metal case containing the Cosmic Cube, which was recovered by Howard Stark in Captain America: The First Avenger. The Tesseract is one of the Infinity Stones.
 * In Odin's Trophy Room there is the Casket of Ancient Winters, Infinity Gauntlet and Warlock's Eye.

The Consultant

 * The short uses scenes directly from The Incredible Hulk.

The Avengers

 * Howard Stark found the Tesseract at the end of Captain America: The First Avenger, studied it as seen in his notebook in Iron Man 2 and it was in S.H.I.E.L.D's custody ever since as seen at the end of Thor.
 * Erik Selvig is shown to be working on the cosmic cube, trying to find out how to harness its power. This shows that it is a continuation from Thor.
 * In the beginning of the film, Selvig made mention to Fury that the Tesseract was giving off low levels of gamma radiation, nothing harmful to hurt humans. However, Fury reminds him that even low levels of gamma radiation can be harmful, clearly reminding him of what happened to Bruce Banner and how he became the Hulk.
 * Audrey Nathan, the Cellist is mentioned twice.
 * When Tony and Pepper are looking at the files on his teammates from the device that Coulson gave them, the footage is taken directly from The Incredible Hulk, Thor and Captain America: The First Avenger.
 * Steve Rogers has a number of flashbacks to his time in the war as he punches a boxing bag, many of these are events that occurred in Captain America: The First Avenger. His montage also includes a glimpse of his half-frozen body and a S.H.I.E.L.D. scientist exclaiming that he's alive, a moment that was not seen in the earlier film. Other scenes are taken directly from Captain America: The First Avenger.
 * Steve Rogers discovered that S.H.I.E.L.D. phase 2's contingency plan is to use the Cosmic Cube's energy to make weapons using Arnim Zola's Hydra energy weapons as seen in Captain America: The First Avenger as a reference point to create their own arsenal of weaponry.
 * When Phil Coulson tries to contact Tony Stark in Stark Tower, Stark claims that "This is the Life Model Decoy of Tony Stark." This is a reference to Life Model Decoys (LMDs) that appear in the comics as duplicates for characters.
 * Tony Stark reminds Phil Coulson that he was "unsuitable" for the Avengers Initiative, as stated in Nick Fury's evaluation file on Tony at the end of Iron Man 2. Instead, he remains a consultant.
 * When Thor returns to Earth, Loki asks him how much dark energy Odin had to use to send him there, confirming that the Bifrost is still destroyed.
 * Phil Coulson refers to The Destroyer 's attack on New Mexico depicted in Thor and reveals that S.H.I.E.L.D. is developing weapons made from parts of it.
 * Bruce Banner refers to his fight with Abomination in The Incredible Hulk when Stark offers a visit to Stark Tower, saying "Thanks, but last time I was in New York, I kind of broke... Harlem."
 * Bruce Banner is said to have avoided a Hulk incident for over a year, meaning that the events of The Avengers take place over a year after The Incredible Hulk. During this time, he has spent his time travelling Asia to help the sickly.
 * A mid credits scene reveals that Loki's ally and the Other's master was Thanos, setting him up as the villain in later films.
 * Agent Coulson tells Thor that his love interest Jane Foster has been hidden from Loki by S.H.I.E.L.D. Her photo is also shown.
 * Nick Fury tells Bruce Banner he has been protecting him from other forces searching for him, meaning General Ross.
 * Pepper Potts' friendship with Phil Coulson echoes (much to Stark's dismay) the extended opening sequence of Iron Man 2 as seen on the Blu-ray.
 * Bruce Banner refers to the alternate opening sequence of The Incredible Hulk where Bruce tried to commit suicide. In the Wishbone lab, Banner tells the rest of the team "I got low. I didn't see an end to it, so I put a bullet in my mouth and the "Other Guy" spat it out."
 * Captain America references either Adolf Hitler or Johann Schmidt when he comes face to face with Loki in Stuttgart, Germany.
 * The song Tony Stark plays from the Quinjet when he makes his grand entrance in Captain America and Loki's fight, Shoot to Thrill by Australian rock band AC/DC,was also played during Tony's arrival at the Stark Expo at the beginning of Iron Man 2.
 * When Rogers talks to Stark about Coulson and why he did what he did, Rogers mentions "sometimes there's no way out." Stark replies he has heard that before, refering back to Yinsen, who saved his life in Iron Man. This makes it the first time in any way that Yinsen is somewhat mentioned since Iron Man.

Item 47

 * Jasper Sitwell of S.H.I.E.L.D. appears.
 * A weapon left by the Chitauri from The Avengers is the titular Item 47.
 * A new S.H.I.E.L.D. Agent is introduced Agent Blake. Benny and Claire are also recruited into S.H.I.E.L.D.

Iron Man 3

 * Tony Stark built 35 new armors since the Chitauri Invasion of New York in The Avengers.
 * Scenes of the invasion from The Avengers are seen in Tony's nightmares.
 * Ho Yinsen appears in a flashback to 1999.
 * A.I.M. is established.
 * Extremis is similar to the Super Soldier Serum, giving its patients superhuman strength.
 * The Chitauri are referred to multiple times as "aliens".
 * S.H.I.E.L.D. is mentioned.
 * Thor Odinson is mentioned by Killian when speaking to Tony, stating "Ever since that big dude with the hammer fell out of the sky, subtlety's kinda had it's day."
 * The Avengers are referenced. Happy Hogan mentions them as the "Super Friends".
 * Thomas Richards was an accountant for the Roxxon Corporation.
 * The Mandarin has a tattoo of Captain America's shield on his neck.
 * The government paint the War Machine Mark II with the color-scheme based on Captain America's uniform dubbing it the Iron Patriot.
 * The post-credits scene reveals the entire movie was Stark recounting the events to Bruce Banner, who had fallen asleep at the beginning of the story.

Thor: The Dark World

 * Jane slaps Loki stating, "That was for New York!", referring to the Chitauri that attacked New York in The Avengers.
 * The war that Loki unleashed in the first Thor ends during the fight scene in Vanaheim.
 * S.H.I.E.L.D. logo and name appears on Jane Foster's device.
 * Thor's appearance in New Mexico is indirectly mentioned.
 * Jane indirectly mentions the Battle of New York during her first talk with Thor.
 * Loki mentions The Avengers as Thor's new companions.
 * Destroying of the Bifrost from the first Thor is mentioned twice.
 * Erik is mentally suffering from the events of The Avengers. News reports claim that Selvig was responsible for the Chitauri invasion. He is also relieved when Thor tells him Loki is dead.
 * The Tesseract is mentioned.
 * Darcy attempts to contact S.H.I.E.L.D. while awaiting Jane's return. She also states how S.H.I.E.L.D. is likely to appear and conceal the strange occurrences. Jane also mentions S.H.I.E.L.D. earlier in the movie.
 * Chitauri are mentioned by the reporter on the tv as aliens. Same reporter also mentions Battle of New York.
 * Loki has been imprisoned in Asgard for his crimes depicted in Thor and The Avengers.
 * Loki briefly masquerades as Steve Rogers while talking to Thor.
 * Jotunheim briefly appears during Thor and Malekith fight scene.
 * Darcy again names Mjölnir as Meow Meow. She previously mispronounced the name in Thor.
 * Taneleer Tivan/The Collector is approached by Sif and Volstagg with the Aether, one of the six Infinity Stones, entrusting him with its care.

All Hail the King

 * Trevor Slattery was taken away by the authorities at the end of Iron Man 3. This One-Shot reveals where he was taken.
 * The short uses scenes directly from Iron Man 3.
 * Seagate Prison is introduced.
 * Jackson Norriss is introduced, and is a member of the Ten Rings.
 * An image of Raza is included in Jackson Norriss file on the Ten Rings.
 * The Mandarin is confirmed to be real, and wants to get even with Trevor for appropriating his name.
 * Aldrich Killian and his schemes from Iron Man 3 are referenced.
 * Justin Hammer is shown to be incarcerated in Seagate Prison after being arrested at the end of Iron Man 2.
 * Fletcher Heggs is introduced as an inmate of Seagate Prisoner.
 * Tony Stark is mentioned.
 * Pepper Potts is mentioned and seen on Forbes cover.
 * Hammer Drones are mentioned.

Captain America: The Winter Soldier

 * Bucky Barnes returns after seemingly falling to his death in Captain America: The First Avenger.
 * Georges Batroc is introduced.
 * The Battle of New York is mentioned.
 * The Triskelion appears.
 * Several Helicarriers and Quinjets appear.
 * The World Security Council appears.
 * Peggy Carter returns as an old woman. She also appears in several photographs and a movie in Captain America Exhibition in the Smithsonian.
 * Howling Commandos are mentioned. The Captain America Exhibition in the Smithsonian has photos and mannequins dressed in the Commandos clothes.
 * Jasper Sitwell and Senator Stern return and are both revealed to be members of HYDRA.
 * Jasper Sitwell mentions Bruce Banner and Stephen Strange.
 * Natasha Romanoff wears an arrow trinket on a necklace. This is a link to Clint Barton.
 * Sgt. Duffy makes an appearance when Steve is at Camp Lehigh and has a flashback of training in the camp before taking the Super Soldier Serum.
 * Arnim Zola appears as robot A.I. interface. This mirrors Zola's comic book appearance, where his body is a robot with a similar camera for a head and a screen in the chest with his face on it.
 * There is mention that HYDRA killed Howard Stark. Photos of Howard also appears in several scenes in the movie.
 * Red Skull is mentioned and appears in the video that Zola shows to Steve and Natasha.
 * Alexander Pierce agrees to do Nick Fury a favor if he gets Iron Man to go to his niece's birthday party.
 * Chester Phillips, Peggy Carter and Howard Stark are recognized as the founders of S.H.I.E.L.D. in photos on the wall of the S.H.I.E.L.D. bunker that houses Arnim Zola.
 * Tony Stark is said to have suggested that S.H.I.E.L.D. update their technology for the Helicarriers and designed repulsor engines for them.
 * President Ellis is referenced in the Captain America exhibit and targeted by the Insight Helicarriers.
 * The repaired Stark Tower, now called The Avengers Tower, appears briefly during the targeting sequence. A photo of Tony Stark briefly appears alongside it along with other unknown and unnamed occupants.
 * Several scenes are taken directly from Captain America: The First Avenger and shown in a movie in Captain America Exhibition in the Smithsonian and in the video that Arnim Zola shows to Steve and Natasha.
 * Maria Hill goes to work for Stark Industries at the end of the film.
 * The Chitauri Scepter that was wielded by Loki is seen in the mid-credits scene.
 * Scarlet Witch and Quicksilver are seen as prisoners of Wolfgang von Strucker and HYDRA in the mid-credits scene.

Guardians of the Galaxy

 * Thanos appears. He first appeared in mid-credits scene in The Avengers.
 * The Other returns. He first appeared in The Avengers.
 * Taneleer Tivan/The Collector and Carina return. They first appeared in mid-credits scene in Thor: The Dark World.
 * The Orb is another Infinity Stone.
 * Cosmo and Howard the Duck are introduced.
 * Eson the Searcher and a Celestial are introduced.
 * When Peter Quill dances in the temple at the beginning of the movie, he touches skeleton that looks like Kymellian skeleton.
 * One Chitauri and one Dark Elf appear in Taneleer Tivan's chambers.
 * The Tesseract and Aether are seen in The Orb's vision.
 * Large part of score from the movie named "The Final Battle Begins" is just modified "The Avengers Theme" from The Avengers.

Avengers: Age of Ultron

 * The repaired Stark Tower, now called Avengers Tower, appears.
 * The Chitauri Scepter appears. It first appeared in The Avengers and was seen briefly in the mid-credits scene of Captain America: The Winter Soldier.
 * Baron von Strucker appears. He first appeared in the mid-credits scene in Captain America: The Winter Soldier.
 * Peggy Carter appears. She first appeared in Captain America: The First Avenger, has a cameo in Captain America: The Winter Soldier and appeared in her own One-Shot and spin-off series.
 * Quicksilver and Scarlet Witch appear. They first appeared in the mid-credits scene in Captain America: The Winter Soldier
 * The Vision is introduced.
 * Mind Stone is introduced. It is one of the Infinity Stones.
 * James Rhodes appears. He previously appeared in Iron Man, Iron Man 2 and Iron Man 3.
 * Erik Selvig appears. He previously appeared in Thor, The Avengers and Thor: The Dark World.
 * Asgard is mentioned.
 * Thanos appears in the mid-credits scene. He previously appeared in The Avengers, Guardians of the Galaxy and Avengers: Age of Ultron.

Ant-Man

 * The Triskelion appears in a flashback in 1989.
 * Peggy Carter appears in the 1989 flashback along with Howard Stark and Mitchell Carson.
 * Pym Particles are introduced.
 * Sam Wilson returns. He previously appeared in Captain America: The Winter Soldier and Avengers: Age of Ultron.
 * The Avengers are mentioned.
 * Steve Rogers and Bucky Barnes appear in the post-credits scene along with Sam Wilson.
 * The New Avengers Facility appears, it first appeared in Avengers: Age of Ultron.
 * Sokovia is mentioned.
 * Tony Stark is mentioned.
 * The Sokovia Accords are mentioned.

Captain America: Civil War

 * Howard Stark appears in a flashback in 1991.
 * Maria Stark is introduced.
 * Bruce Banner is mentioned.
 * The Battle of New York, the Attack on the Insight Helicarriers, and the Battle of Sokovia appear in archival footage.
 * Thaddeus Ross appears. He first appeared in The Incredible Hulk.
 * The Sokovia Accords are introduced.
 * T'Challa is introduced.
 * Peter Parker is introduced.
 * May Parker is introduced.

Doctor Strange

 * Thor Odinson appears in a mid-credits scene.
 * Dr. Strange is introduced.
 * The Avengers are mentioned.
 * The Time Stone is revealed to be in the Eye of Agamotto. The Time Stone is one of the Infinity Stones.
 * The Multiverse is introduced.

Guardians of the Galaxy Vol. 2

 * Mantis is introduced.
 * Ego the Living Planet is introduced and is revealed to be Peter Quill's father.
 * Ayesha and the Sovereign species are introduced.
 * Adam Warlock is introduced in a post-credits scene as being created by Ayesha to destroy the Guardians.

Spider-Man: Homecoming
Midtown School of Technology and Science is introduced.
 * Ned Leeds is introduced.
 * Liz Allan is introduced.
 * Vulture is introduced.
 * Herman Schultz and Jackson Brice are introduced.
 * Aaron Davis is introduced.
 * Mac Gargan is introduced.
 * Miles Morales is referenced by Aaron Davis/Prowler when talking to Spider-Man stating "I've got a nephew living out here". In a deleted post credits scene, Aaron apologizes to Miles for not making it in time telling him "Yeah, sorry, Miles".
 * The film's prologue is set after the events of The Avengers.
 * The film's opening scene is set in Captain America: Civil War while the rest is set after it.

Fury's Big Week

 * Project P.E.G.A.S.U.S. is created.
 * Agent Coulson picks up atmospheric disturbances above Mexico.
 * Nick Fury’s team work on a lithium-based solution to Tony Stark’s palladium poisoning.
 * Natasha Romanoff is engaged to follow both Tony Stark and Bruce Banner.
 * Clint Barton and Phil Coulson retrieve The Destroyer and send it to Roswell where it is secured.
 * Nick Fury meets with General Ross before the General catches Hulk, to dissuade him from continuing experiments with the Super-Soldier serum.
 * Romanoff finds Samuel Sterns after his transformation into The Leader, shoots him in the knee then asks for S.H.I.E.L.D. to clean the scene.
 * Phil Coulson asks S.H.I.E.L.D. scientists to dismantle the Destroyer and make it a human-size weapon.
 * After Steve Rogers is found in Antarctica, Fury leads Barton to Project P.E.G.A.S.U.S. so he can keep an eye on Dr. Erik Selvig.

"Pilot"

 * Phil Coulson appears and despite allegedly dying in The Avengers is alive. His apparent death at the hands of Loki is also acknowledged.
 * It is revealed that Coulson believes Nick Fury faked his death to bring the Avengers together, however, the exact method of his resurrection may have more sinister origins due to an exchange between Maria Hill and Dr. Streiten.
 * Maria Hill appears and oversees Coulson's creation of a team.
 * Agent Ward has the best espionage scores since Agent Romanoff aka Black Widow.
 * Nick Fury is mentioned.
 * The Battle of New York is mentioned.
 * Project T.A.H.I.T.I. is indirectly mentioned.
 * The Avengers are mentioned.
 * Tony Stark, Iron Man and the Stark Tower are mentioned. Iron Man is also seen flying in recycled footage.
 * Iron Man is mentioned and seen in recycled footage.
 * Thor Odinson is mentioned and seen in recycled footage.
 * Mjölnir is seen in recycled footage.
 * The Hulk is mentioned and seen in recycled footage.
 * Captain America is mentioned.
 * Captain America's shield is seen in recycled footage.
 * There are toys of Iron Man, Thor, Hulk, Captain America, Black Widow and Hawkeye.
 * The Chitauri are mentioned and seen in recycled footage.
 * Centipede, which uses Extremis, appears.
 * Project Puente Antiguo (New Mexico) and Project P.E.G.A.S.U.S. are mentioned.
 * Gamma Radiation and the Super Soldier Serum are mentioned.
 * The S.H.I.E.L.D. Helicarrier is mentioned.
 * Abraham Erskine is mentioned.
 * Abomination is seen in recycled footage.
 * It seems that Lola is a perfected version of the flying car Howard Stark effortlessly tried to present at the World Exposition of Tomorrow in Captain America: The First Avenger.

"0-8-4"

 * Nick Fury makes an appearance.
 * Mjölnir is mentioned and was the last 0-8-4 before this object.
 * Captain America is mentioned.
 * HYDRA, WWII and the Tesseract are mentioned.
 * Battle of New York is mentioned.
 * Loki Laufeyson is mentioned as the Asgardian.
 * The Chitauri Scepter is mentioned.
 * Tony Stark is mentioned.
 * The Chitauri are mentioned as aliens.

"The Asset"

 * The Avengers are mentioned.
 * Coulson's "death" is mentioned.
 * Nick Fury is mentioned.
 * The Battle of New York is mentioned.
 * Maynard Ward is mentioned as Grant Ward's brother.
 * Franklin Hall is introduced in this episode.
 * Agent Tyler, the "Maintenance Guy" from The Avengers, appears.

"Eye-Spy"

 * The Chitauri are mentioned as aliens.
 * The Battle of New York is mentioned.

"Girl In The Flower Dress"

 * Captain America is mentioned.
 * Coulson "death" is mentioned.
 * Extremis is mentioned.

"FZZT"

 * Coulson's "death" is mentioned.
 * A Chitauri helmet appears.
 * The Battle of New York is mentioned.
 * Captain America is mentioned.
 * Agent Blake makes an appearance.
 * Iron Man is mentioned.

"The Hub"

 * Jasper Sitwell appears.
 * Natasha Romanoff and Clint Barton are mentioned.
 * Triskelion is mentioned.
 * Nick Fury is mentioned.
 * Victoria Hand is introduced.
 * The Hub appears.

"The Well"

 * Asgard is mentioned and seen in recycled footage.
 * Destroyer is seen in recycled footage.
 * The Battle of New Mexico is seen in recycled footage.
 * Thor is mentioned and seen in recycled footage.
 * Mjölnir is seen in recycled footage.
 * Harrow is seen in recycled footage.
 * The Battle of Greenwich is seen in recycled footage.
 * While examining the wreckage found in the Greenwich University, Agent Ward notes, We don't want anything alien getting into the wrong hands. The comment is an ominous reminder of when just such a thing happened in Marvel One-Shot: Item 47.
 * The Berserker Staff appears.
 * Maynard Ward is introduced in flashbacks.
 * The Hulk is mentioned.
 * The Chitauri are mentioned.
 * An Asgardian appears.
 * Coulson's "death" is mentioned.
 * The Bus interrogation room is revealed to be made from Vibranium amongst other materials.
 * Coulson recomends that Randolph relocate to Portland, saying the city has a great symphony. In The Avengers, it's implied that Coulson is involved with an unnamed cellist from Portland.

"Repairs"

 * The gas station is owned by the Roxxon Corporation.
 * The Battle of Greenwich is mentioned.
 * Agent Simmons thinks Tobias Ford is trapped in an alien world. Fitz says they were reports of multiple portals in London after the spaceship landed. He's referencing the events of Thor: The Dark World.

"The Bridge"

 * Captain America is mentioned.
 * Thor Odinson is mentioned.
 * Avengers are mentioned.
 * Toys of Iron Man, Hulk, Captain America and Hawkeye are seen.
 * Coulson's death is mentioned.
 * Michael Peterson returns.
 * Raina returns.
 * Edison Po returns.
 * Akela Amador and the technology she had implanted in her eye are mentioned.
 * Centipede Serum, which uses Extremis and Super Soldier Serum, appears.
 * Audrey Nathan the cellist is mentioned.
 * Michael Peterson indirectly mentions Battle of New York.

"The Magical Place"

 * T. Vanchat is introduced.
 * Victoria Hand returns.
 * J. Streiten returns.
 * Raina returns.
 * Michael Peterson returns.
 * Coulson's "death" is mentioned.
 * A Chitauri metal scrap appears.
 * Centipede Serum, which uses Extremis and Super Soldier Serum, appears.
 * The device The Clairvoyant used to kill Edison Po is similar to the one Obadiah Stane used on Raza in Iron Man.
 * Agent Hand refers to Skye as "The Consultant". That's the same title assigned to Tony Stark by Agents Coulson and Sitwell in Marvel One-Shot: The Consultant.
 * Nick Fury appears in recycled footage, while Maria Hill and Jasper Sitwell are mentioned.
 * Audrey Nathan the cellist is mentioned.
 * The Battle of New York is indirectly mentioned.

"Seeds"

 * The Science and Technology Division of the S.H.I.E.L.D. evolved out of the Strategic Scientific Reserve.
 * Bucky Barnes name is listed on the Wall of Valor and noticed by Skye.
 * Nick Fury is mentioned.
 * Jemma Simmons mentions HYDRA, Centipede and A.I.M.
 * Ian Quinn returns.
 * Donnie Gill appears and is involved with an accident that gives him superpowers.

"T.R.A.C.K.S."

 * Emil Blonsky is referenced and said to be in a cryo-cell in Alaska.
 * Raina and Edison Po are shown in photographs.
 * The Clairvoyant is mentioned.
 * Ian Quinn returns and has ties to Cybertek.
 * Mike Peterson returns.
 * Asgard is mentioned.
 * The agents are stunned with an evolved form of dendrotoxin, the same substance found in the Night-Night Gun invented by Fitz and Simmons.
 * Peterson's bionic leg is revealed to be part of Project Deathlok.

"T.A.H.I.T.I."

 * Nick Fury is mentioned.
 * Ian Quinn returns.
 * Coulson's "death" is mentioned.
 * Project Deathlok and Cybertek are mentioned.
 * The Battle of New York is mentioned.
 * The Clairvoyant is mentioned.
 * S.H.I.E.L.D. Jump Jet appears.
 * Triskelion is mentioned.
 * Dr. Streiten is mentioned.
 * Jonathan Garrett is introduced.
 * Antoine Triplett is introduced.
 * A blue-skinned alien is seen.
 * Project T.A.H.I.T.I. and the GH.325 appear.
 * Lorelei is introduced.

"Yes Man"

 * Lady Sif makes an appearance.
 * Lorelei makes an appearance.
 * Jasper Sitwell makes an appearance.
 * Asgardians are mentioned.
 * Thor is mentioned.
 * Loki is mentioned.
 * Dark Elves and their attack on Asgard are mentioned.
 * Lorelei escaped from the prison during the events of Thor: The Dark World.
 * GH.325 appears.
 * Coulson asks Lady Sif about alien species she's encountered who have blue skin. She lists Interdites, Levians, Pheragots, Kree, Sarks, Centaurians and Frost Giants. Coulson was asking about it because he wanted to know which alien species is G.H.
 * Nick Fury is mentioned.
 * Ian Quinn is mentioned.
 * Michael Peterson and Project Deathlok are mentioned.
 * John Garrett is mentioned.
 * Dr. Streiten was shown in flashback.
 * Erik Selvig is mentioned.
 * Jane Foster is mentioned.
 * The Battle of New Mexico is mentioned.
 * The Battle of Greenwich is indirectly mentioned.
 * The Warriors Three are mentioned as "Thor's mates".
 * Asgard is mentioned.
 * Destroyer is mentioned as "giant metal killing machine".
 * Coulson's "death" is mentioned.
 * Nine Realms are mentioned.
 * Before the two Asgardians engage in their final battle, Lorelei references Balder a love interest of Sif's that she clearly stole away. It's the reference to the Thor's brother Balder the Brave
 * Bifrost is mentioned.
 * The Centipede Group is mentioned.
 * Berserker Staff is mentioned.
 * Odin is mentioned.

"End of the Beginning"

 * Jasper Sitwell returns and is told that he has orders from the Triskelion to go to S.H.I.E.L.D. vessel, the Lemurian Star which is where Sitwell is taken hostage in Captain America: The Winter Soldier.
 * Felix Blake returns.
 * Mike Peterson/Deathlok returns.
 * John Garrett returns.
 * Antoine Triplett returns.
 * Victoria Hand returns.
 * S.H.I.E.L.D. Jump Jet appears.
 * Lorelei is mentioned as the Asgardian.
 * Thomas Nash is introduced as the Clairvoyant's decoy.
 * Project Deathlok appears.
 * Edison Po is mentioned.
 * Raina is mentioned.
 * Agent Blake mentions Mike Peterson's son.
 * The Fridge, S.H.I.E.L.D.'s secret prison, is mentioned.
 * Nick Fury is mentioned and seen trying to escape from HYDRA and the Winter Soldier.
 * The Centipede Group is mentioned.
 * Ian Quinn is mentioned.

"Turn, Turn, Turn"

 * John Garrett returns.
 * Antoine Triplett returns.
 * Victoria Hand returns.
 * Anne Weaver returns.
 * It is revealed that Melinda May's secure line was to Nick Fury.
 * Nick Fury's "death" is mentioned several times.
 * Captain America is mentioned.
 * S.H.I.E.L.D. Jump Jet appears.
 * John Garrett and Agent Ward are revealed to be working with HYDRA.
 * HYDRA's presence is revealed with sleeper agents.
 * Agent Blake is mentioned.
 * The main action of this episode takes place at The Hub.
 * GH.325 is mentioned.
 * Project T.A.H.I.T.I. is mentioned.
 * Garrett tells Coulson, "I wouldn't say I'm a true believer" in a nod to Stan Lee's famous phrase.
 * Fitz is revealed to have created the Mouse Hole which Nick Fury and Maria Hill both use to escape in Captain America: The Winter Soldier.
 * Asgardian weaponry is mentioned.
 * Donnie's weather machine is mentioned.
 * Gravitonium is mentioned.
 * Akela Amador is mentioned.
 * Mike Peterson/Deathlok is mentioned.
 * Project Deathlok is referenced.
 * Raina is mentioned as "that bitch in the flower dress".
 * Ian Quinn is mentioned.
 * Agent Sitwell is mentioned.
 * Helicarriers are mentioned.
 * Triskelion is mentioned and seen on a S.H.I.E.L.D. screen.
 * The Helicarrier crashing from Captain America: The Winter Soldier is seen on S.H.I.E.L.D. screen.
 * The Treehouse and an East African Headquarters are mentioned.

"Providence"

 * John Garrett returns.
 * Antoine Triplett returns.
 * Raina returns.
 * Ian Quinn returns.
 * Colonel Glenn Talbot is introduced.
 * Marcus Daniels/Blackout makes cameo appearance.
 * Agent Eric Koenig is introduced.
 * The Helicarrier crashing from Captain America: The Winter Soldier is seen on S.H.I.E.L.D. screen.
 * President Matthew Ellis is mentioned as The President.
 * The Hub appears.
 * Triskelion is mentioned and seen on S.H.I.E.L.D. screen.
 * HYDRA soldiers appears.
 * Coulson's death is mentioned.
 * Centipede project is mentioned.
 * Nick Fury and his death are mentioned.
 * S.H.I.E.L.D. Jump Jet appears.
 * The Cube is mentioned.
 * Victoria Hand is mentioned.
 * The Fridge appears.
 * Captain America is mentioned.
 * Maria Hill is mentioned.
 * GH.325 is mentioned.
 * Barbershop Headquaters appear.
 * Ward mentioned rescuing Simmons from a previous mission.
 * Black Widow is mentioned.
 * Project T.A.H.I.T.I. is mentioned.
 * Johnny Horton is mentioned.
 * The Tesseract is mentioned.
 * The Battle of New York is mentioned.
 * The Plasma Particle Beam HYDRA weapon and the Berserker Staff appears.
 * The Providence appears.
 * Chitauri are mentioned.
 * Metal scrap is seen under Garrett's clothes. In the comics Garrett was a cyborg hero named Aquarius.
 * Gravitonium with Franklin Hall inside it returns.

"The Only Light in the Darkness"

 * Antoine Triplett returns.
 * Agent Eric Koenig returns.
 * The Cellist, Audrey Nathan is introduced. She was mentioned twice in The Avengers and several times in various Agents of S.H.I.E.L.D. episodes.
 * Marcus Daniels/Blackout is introduced.
 * The Fridge is mentioned and appears in recycled footage from previous episode.
 * John Garrett appears in recycled footage from previous episode.
 * HYDRA is mentioned and appears in recycled footage from previous episode.
 * The Plasma Particle Beam is mentioned and appears in recycled footage from previous episode.
 * The Berserker Staff appears in recycled footage from previous episode.
 * President Ellis is mentioned on the radio as "The President".
 * The Providence appears.
 * Ian Quinn and his shooting Skye in a stomach from "T.R.A.C.K.S. episode" are mentioned.
 * S.H.I.E.L.D. Jump Jet appears.
 * Nick Fury is mentioned.
 * Natasha Romanoff is mentioned.
 * Project Insight is mentioned.
 * Alexander Pierce is mentioned.
 * It is revealed that Antoine Triplett is grandson of one of Howling Commandos, presumably Gabe Jones, notable for being the sole African-American member of the squad during a time prior to the desegregation of the United States Military.
 * Maynard Ward is mentioned as Grant Ward's brother.
 * Darkforce appears.
 * Project T.A.H.I.T.I. is mentioned.
 * Steve Rogers and his shield are mentioned.
 * Coulson's "death" is mentioned.
 * Bruce Banner is mentioned.
 * Melinda May's Mother is introduced.
 * Maria Hill is mentioned as "Maria".

"Nothing Personal"

 * Maria Hill returns.
 * Antoine Triplett returns.
 * Mike Peterson/Deathlok returns.
 * Colonel Glenn Talbot returns.
 * The Fridge is mentioned.
 * Man-Thing is mentioned.
 * At the beginning of the episode Maria Hill was talking on the phone with Pepper Potts.
 * Tony Stark is mentioned.
 * The Providence appears.
 * S.H.I.E.L.D. Jump Jet appears.
 * Project T.A.H.I.T.I. is mentioned.
 * G.H. is mentioned as an "alien".
 * Nick Fury and his "death" are mentioned.
 * Alexander Pierce is mentioned.
 * HYDRA is mentioned.
 * The dead body of Eric Koenig appears.
 * Project Deathlok appears.
 * Jonathan Garrett is mentioned.
 * Audrey Nathan is mentioned.
 * Victoria Hand is mentioned.
 * Red Skull is mentioned.
 * Thomas Nash is mentioned.
 * Ian Quinn is mentioned.
 * Mindy and Ace Peterson are mentioned as Mike Peterson's kid and Ace's aunt.
 * The Triskelion is mentioned.
 * Natasha Romanoff is mentioned.
 * The Avengers are indirectly mentioned.
 * GH.325 is indirectly mentioned.

"Ragtag"

 * John Garrett returns.
 * Antoine Triplett returns.
 * Mike Peterson/Deathlok returns.
 * Ian Quinn returns.
 * Raina returns.
 * Christian Ward is mentioned as Grant Ward's brother.
 * Cybertek facility and employees appear.
 * Files about Project Deathlok appear.
 * HYDRA soldiers appear.
 * Barbershop Headquaters appear.
 * S.H.I.E.L.D. Jump Jet appears.
 * The Night-Night Gun is mentioned as "Sleepy-Sleep Gun".
 * The Dendrotoxin Grenade is mentioned.
 * Garrett is revealed to be the first Deathlok.
 * Recreated GH.325 appears.
 * Centipede Serum appears.
 * Centipede Soldiers are mentioned.
 * Ace Peterson is mentioned as Michael Peterson's son.
 * Coulson and Skye's resurrections are mentioned.
 * Howling Commandos and Antoine Triplett's grandfather are mentioned.
 * Antoine Triplett's grandfather's gadgets appear.
 * S.H.I.E.L.D. Academy is mentioned.
 * After injecting recreated GH.325, Garrett was glowing like the Extremis soldiers did.
 * The Berserker Staff appears.

"Beginning of the End"

 * Nick Fury makes an appearance.
 * John Garrett returns and is upgraded with the latest Deathlok technology.
 * Mike Peterson/Deathlok returns.
 * Ian Quinn returns.
 * Antoine Triplett returns.
 * Raina returns.
 * Ace Peterson returns.
 * Mindy returns.
 * Barbershop Headquaters appear.
 * Many Deathlok soldiers appear.
 * S.H.I.E.L.D. Jump Jet appears.
 * GH.325 is mentioned as the "miracle drug".
 * The Berserker Staff appears.
 * Antoine Triplett's grandfather's gadgets appear.
 * Gravitonium appears.
 * HYDRA soldiers appear.
 * Cybertek employees and facility appear.
 * Centipede Group is mentioned.
 * Coulson's Revenge appears.
 * A Hulk toy appears.
 * Plasma Particle Beam appears.
 * The Avengers are indirectly mentioned.
 * The Playground appears.
 * Billy Koenig, twin brother of Eric Koenig, is introduced.
 * Skye's father is introduced.
 * Phillip Coulson becomes the new director of S.H.I.E.L.D.
 * The drawings Coulson and Garrett make are extremely similar to the drawings on the chalkboard in the facility in Belarus which Centipede tasked Akela Amador to steal, and are likely in the same alien language.

"Shadows"

 * Peggy Carter, Dum-Dum Dugan and Jim Morita appear in 1940' flashback scene.
 * Lance Hunter is introduced.
 * Carl Creel is introduced.
 * Isabelle Hartley is introduced.
 * Alphonso Mackenzie is introduced.
 * Idaho is introduced.
 * Daniel Whitehall is introduced.
 * Sunil Bakshi is introduced.
 * Jemma Simmons appears as a hallucination of Fitz.
 * Antoine Triplett returns.
 * Glenn Talbot returns.
 * Billy Koenig returns.
 * A Lola miniature toy, propaganda poster with Captain America and a Strategic Scientific Reserve logo are seen in Coulson's office.
 * HYDRA soldiers appear in modern times and in a 1940' flashback scene with their appearance being that of how they looked in Captain America: The First Avenger.
 * John Garrett is mentioned.
 * Rising Tide is mentioned.
 * Electronic copy of the mysterious drawing Coulson and Garrett made at the end of Beginning of the End appears.
 * Red Skull is mentioned.
 * Howard Stark is mentioned.
 * Nick Fury is mentioned.
 * Dead G.H. appears in 1940' flashback scene.
 * I.C.E.R. guns appear.
 * Strategic Scientific Reserve is mentioned.
 * It is revealed that John Garrett was supervising agent of Carl Creel.
 * Eric Koenig is mentioned.
 * Skye's father is mentioned.
 * Same gun used to incapacitate Deathlok at the beginning of "episode 16" is used to incapacitate Carl Creel.
 * Antoine Triplett goes undercover as General Jones. This is a possible hint that his grandfather was Gabriel Jones.
 * Quinjets appear.

"Heavy is the Head"

 * Jemma Simmons appears as a hallucination of Fitz.
 * Glenn Talbot returns.
 * Raina returns.
 * Dead body of Idaho appears.
 * Carl Creel returns.
 * Sunil Bakshi returns.
 * Skye's father returns.
 * HYDRA appears.
 * Obelisk appears.
 * John Garrett is mentioned
 * GH.325 is mentioned
 * Isabelle Hartley is mentioned.
 * Mouse Hole appears.
 * Quinjet appears.
 * Billy Koenig is mentioned.
 * Photo of Peggy Carter appears.
 * A Lola miniature toy, propaganda poster with Captain America and a Strategic Scientific Reserve logo are seen in Coulson's office.
 * Daniel Whitehall is mentioned.
 * World War II fight with HYDRA is indirectly mentioned.
 * Coulson makes new drawing the same as he made at the end of season 1.
 * Holographic plans of D.W.A.R.F.s, Gravitonium and Plasma Particle Beam appear.
 * ICER appears.
 * Christian Ward is mentioned as "senator with very deep pockets".
 * Helicarriers are mentioned.

"Making Friends and Influencing People"

 * Jemma Simmons returns.
 * Grant Ward returns.
 * Donnie Gill returns.
 * HYDRA appears.
 * Sunil Bakshi returns.
 * Daniel Whitehall returns.
 * Quinjet is mentioned.
 * John Garrett is mentioned.
 * Christian Ward is mentioned as Grant Ward's brother.
 * S.H.I.E.L.D. Academy is mentioned.
 * Strategic Scientific Reserve logo appears.
 * Lola is mentioned.
 * Moment when Gill got his superpowers is mentioned.
 * Moment when Ward threw Fitz and Simmons into ocean is mentioned.
 * Sandbox is mentioned.
 * Bobbi Morse is indirectly mentioned.
 * Skye's father is mentioned.

"Face My Enemy"

 * Glenn Talbot returns.
 * Sunil Bakshi returns.
 * Agent 33 returns.
 * Daniel Whitehall returns.
 * Raina returns.
 * Jemma Simmons appears as a hallucination of Fitz.
 * HYDRA appears.
 * Obelisk symbols appear on a painting. These symbols were written by John Garrett and Phil Coulson.
 * Lola is mentioned.
 * John Garrett is mentioned.
 * ICER appears.
 * Photostatic Veil appears. It's the same device Black Widow used as disguise in Captain America: The Winter Soldier.
 * Obelisk is mentioned.
 * Grant Ward is mentioned.
 * Propaganda poster with Captain America is seen in Coulson's office.
 * Strategic Scientific Reserve logo appears.
 * Quinjet appears.

"A Hen in the Wolf House"

 * Barbara Morse is introduced.
 * Grant Ward returns.
 * Jemma Simmons returns.
 * Raina returns.
 * Daniel Whitehall returns.
 * Skye's Father returns.
 * Sunil Bakshi returns.
 * Kenneth Turgeon returns.
 * HYDRA appears.
 * The Obelisk appears.
 * The Strategic Scientific Reserve logos appear.
 * Rising Tide is mentioned.
 * Captain America appears on an old propaganda poster.
 * Johann Schmidt is mentioned as "our founder".
 * Tesseract is mentioned.
 * Bessie the Hellcow is mentioned.
 * John Garrett and his injection of GH.325 are mentioned.
 * A Quinjet appears.
 * Bobbi Morse's fighting techniques mirror Black Widow's.

"A Fractured House"

 * Grant Ward's brother, Christian Ward appears as a US senator.
 * HYDRA appears.
 * The Strategic Scientific Reserve logo appears.
 * Chitauri are mentioned.
 * Battle of New York is mentioned.
 * The Avengers are mentioned.
 * Daniel Whitehall is mentioned.
 * New alien writings appear as tattoos.
 * Propaganda poster with Captain America appears.
 * Marcus Scarlotti is introduced.
 * Lola miniature toy appears.
 * Quinjet appears.
 * Thomas Ward is mentioned.
 * The Well accident with the Ward brothers is mentioned.
 * Skye's father is mentioned.
 * The Diviner is mentioned.
 * Skye's mother is mentioned.
 * Raina is mentioned.
 * Victoria Hand is mentioned.
 * Eric Koenig is mentioned.
 * Clint Barton is mentioned.

"The Writing on the Wall"

 * Sunil Bakshi returns.
 * New alien writings appear.
 * Quinjet appears.
 * Baron von Strucker is mentioned.
 * The Obelisk is mentioned.
 * Strategic Scientific Reserve logo appears.
 * T.A.H.I.T.I. is mentioned.
 * The Guest House, G.H., GH.325 and Memory Overwriting Machine are mentioned and appear in Coulson's memory.
 * John Garrett is mentioned.
 * Triskelion is mentioned.
 * One of Janice Robbins' paintings is signed as A Magical Place. It's the same answer Coulson gave every time he heard the word Tahiti in season 1.
 * Daniel Whitehall is mentioned.
 * Nick Fury is mentioned.
 * Theta Brain-Wave Frequency Machine appears.
 * The Avengers are mentioned.
 * Captain America is mentioned and appears on propaganda poster in Coulson's office.
 * Iron Man is mentioned.
 * Christian Ward is mentioned and appears on the photo in a newspaper.
 * HYDRA appears.

"The Things We Bury"

 * Peggy Carter appears.
 * Skye's Mother is introduced.
 * Daniel Whitehall appears.
 * Sunil Bakshi appears.
 * Skye's Father appears.
 * Christian Ward appears.
 * HYDRA appears.
 * The Obelisk appears.
 * Red Skull is mentioned.
 * Nick Fury is mentioned.
 * Alexander Pierce is mentioned.
 * "The Rat" is introduced.
 * Strategic Scientific Reserve logo appears.
 * Howling Commandos are mentioned.
 * Audrey Nathan is mentioned.
 * Asgardians are mentioned.
 * Kree are mentioned as "blue angels" and aliens.
 * Thomas Ward is mentioned.
 * Tesseract is mentioned.
 * Sunil Bakshi says famous HYDRA catchphrase "Cut off one head, two more shall take it's place".