|Release Date:||April 26, 2019|
|Running Time:||181 mins|
Three weeks after Thanos used the Infinity Gauntlet to disintegrate half of all life in the universe, Carol Danvers rescues Tony Stark and Nebula from deep space and returns them to Earth. They reunite with the remaining Avengers—Bruce Banner, Steve Rogers, Rocket, Thor, Natasha Romanoff, and James Rhodes—and use Nebula's knowledge to find and ambush Thanos. They plan on retaking the Infinity Stones and using them to reverse the disintegrations, but Thanos reveals he has already destroyed them to prevent further use. An enraged Thor decapitates Thanos.
Five years later, Scott Lang escapes from the quantum realm. He travels to the Avengers' compound, where he explains to Romanoff and Rogers that he experienced only five hours while trapped. Theorizing that the quantum realm could allow time travel, the three ask Stark to help them retrieve the Stones from the past to reverse Thanos' actions in the present, but Stark refuses to help out of fear of losing his daughter, Morgan. After looking at a photo of himself and Peter Parker and talking with his wife Pepper Potts, Stark relents and he and Banner, who has since merged his intelligence with the Hulk's strength and body, successfully build a time machine. Banner warns that changing the past does not affect their present, and that any changes instead create branched alternate realities. He and Rocket go to New Asgard, the Asgardian refugees' new home in Norway, to recruit Thor, now an overweight alcoholic despondent over his failure to stop Thanos. In Tokyo, Romanoff recruits Clint Barton, now a ruthless vigilante following the disintegration of his family.
Banner, Lang, Rogers, and Stark travel to New York City in 2012. Rogers successfully retrieves the Mind Stone, but Stark and Lang's interference inadvertently allows 2012 Loki to escape with the Space Stone. Rogers and Stark travel to S.H.I.E.L.D. headquarters in 1970. Stark obtains an earlier version of the Space Stone, encountering his father, Howard, in the process, while Rogers steals several Pym Particles from Hank Pym to return to the present. Rocket and Thor travel to Asgard in 2013. They extract the Reality Stone from Jane Foster and retrieve Thor's hammer, Mjolnir. Nebula and Rhodes travel to Morag in 2014 and steal the Power Stone before Peter Quill can. Rhodes returns to the present with the Power Stone, but Nebula is incapacitated when her cybernetic implants link with those of her past self. Through this connection, 2014 Thanos learns of his future success and the Avengers' attempts to undo it. Thanos captures present-Nebula and sends past-Nebula to the present day disguised as her future self. Barton and Romanoff travel to Vormir, where the Soul Stone's keeper, the Red Skull, reveals it can only be acquired by sacrificing someone they love. Romanoff sacrifices herself, allowing Barton to obtain the Soul Stone.
Reuniting in the present, the Avengers fit the Stones into a Stark-created gauntlet, which Banner uses to resurrect all those whom Thanos had disintegrated. Past-Nebula uses the time machine to transport past Thanos and his warship to the present where he attacks the Avengers' compound, planning to completely wipe out and then rebuild the universe with the Stones. Nebula convinces past-Gamora to betray Thanos, and kills her past self. Stark, Rogers, and Thor battle Thanos but are outmatched. A restored Stephen Strange arrives with other Masters of Mystic Arts, the restored Avengers and Guardians of the Galaxy, as well as the armies of Wakanda, Asgard, and the Ravagers to fight Thanos and his army alongside Danvers, who destroys Thanos' warship as she arrives. After overpowering the heroes, Thanos seizes the gauntlet, but Stark steals the Stones and uses them to disintegrate Thanos and his army, dying from the energy emitted in the process.
Following Stark's funeral, Thor appoints Valkyrie as the ruler of New Asgard and joins the Guardians of the Galaxy while Quill searches for 2014 Gamora. Rogers returns the Infinity Stones to their original places in time, and remains in the past to live with Peggy Carter. In the present, an elderly Rogers passes on his shield and mantle to Sam Wilson.
- Robert Downey, Jr. as Tony Stark/Iron Man
- Chris Evans as Steve Rogers/Captain America
- Mark Ruffalo as Bruce Banner/Hulk
- Chris Hemsworth as Thor Odinson
- Scarlett Johansson as Natasha Romanoff/Black Widow
- Jeremy Renner as Clint Barton/Hawkeye
- Don Cheadle as James Rhodes/War Machine
- Paul Rudd as Scott Lang/Ant-Man
- Benedict Cumberbatch as Stephen Strange/Dr. Strange
- Chadwick Boseman as T'Challa/Black Panther
- Brie Larson as Carol Danvers/Captain Marvel
- Tom Holland as Peter Parker/Spider-Man
- Karen Gillan as Nebula and Nebula (2014)
- Zoe Saldana as Gamora
- Evangeline Lilly as Hope van Dyne/Wasp
- Tessa Thompson as Valkyrie
- Rene Russo as Frigga
- Elizabeth Olsen as Wanda Maximoff
- Anthony Mackie as Sam Wilson/Falcon
- Sebastian Stan as Bucky Barnes/Winter Soldier
- Tom Hiddleston as Loki Laufeyson (2012) and Loki Laufeyson (2013)
- Danai Gurira as Okoye
- Benedict Wong as Wong
- Pom Klementieff as Mantis
- Dave Bautista as Drax
- Letitia Wright as Shuri
- John Slattery as Howard Stark
- Tilda Swinton as Ancient One
- Jon Favreau as Happy Hogan
- Hayley Atwell as Peggy Carter
- Natalie Portman as Jane Foster
- Marisa Tomei as May Parker
- Taika Waititi as Korg
- Angela Bassett as Ramonda
- Michael Douglas as Hank Pym
- Michelle Pfeiffer as Janet van Dyne
- William Hurt as Thaddeus Ross
- Cobie Smulders as Maria Hill
- Vin Diesel as Groot
- Bradley Cooper as Rocket
- Gwyneth Paltrow as Pepper Potts/Rescue
- Robert Redford as Alexander Pierce
- Josh Brolin as Thanos and Thanos (2014)
- Chris Pratt as Peter Quill/Star-Lord
- Samuel L. Jackson as Nick Fury
- Winston Duke as M'Baku
- Linda Cardellini as Laura Barton
- Maximiliano Hernández as Jasper Sitwell
- Frank Grillo as Brock Rumlow
- Hiroyuki Sanada as Akihiko
- Tom Vaughan-Lawlor as Ebony Maw
- James D'Arcy as Edwin Jarvis
- Jacob Batalon as Ned Leeds
- Lexi Rabe as Morgan Stark
- Ross Marquand as Red Skull/Stonekeeper
- Gozie Agbo as Grieving Man
- Emma Fuhrmann as Cassie Lang
- Michael James Shaw as Corvus Glaive
- Terry Notary as Cull Obsidian
- Kerry Condon as F.R.I.D.A.Y.
- Ben Sakamoto as Cooper Barton
- Ava Russo as Lila Barton
- Cade Woodward as Nathaniel Barton
- Stan Lee as Driver
- Yvette Nicole Brown as Phyllis Jenkins
- Callan Mulvey as Jack Rollins
- Lia Mariella Russo as Lia
- Julian Russo as Julian
- Taylor Patterson as Taylor
- Agostino Rosalina as Augie
- Ken Jeong as Security Guard
- Ty Simpkins as Harley Keener
- Monique Ganderton as On-Set Proxima Midnight
- Jim Starlin as Support Group Man #1
Continuity and References to the Marvel Cinematic Universe
- The Decimation is referenced.
- Tony Stark appears.
- Steve Rogers/Captain America appears.
- Bruce Banner appears.
- Thor Odinson appears.
- Natasha Romanoff/Black Widow appears.
- Clint Barton/Ronin appears.
- James Rhodes/War Machine appears.
- Scott Lang/Ant-Man appears.
- Carol Danvers appears.
- Rocket appears.
- Nebula appears.
- Okoye appears.
- Thanos appears.
- Wong appears.
- Happy Hogan appears.
- Pepper Potts appears.
- Peggy Carter appears.
- The Benatar appears.
- Nick Fury appears.
- Maria Hill appears.
- Doctor Strange appears.
- T'Challa/Black Panther appears.
- Peter Parker/Spider-Man appears.
- Gamora appears.
- Hope van Dyne/Wasp appears.
- Wanda Maximoff appears.
- Sam Wilson/Falcon appears.
- Bucky Barnes/Winter Soldier appears.
- Peter Quill/Star-Lord appears.
- Drax appears.
- Groot appears.
- Mantis appears.
- Shuri appears.
- Hank Pym appears.
- Janet van Dyne appears.
- Laura Barton appears.
- Cooper Barton appears.
- Lila Barton appears.
- Nathaniel Barton appears.
- Alexander Pierce appears.
- Jasper Sitwell appears.
- Brock Rumlow appears.
- Jack Rollins appears.
- Harley Keener appears.
- Valkyrie appears.
- Cassie Lang appears.
- Frigga appears.
- Loki appears.
- Howard Stark appears.
- Ancient One appears.
- Edwin Jarvis appears.
- Jane Foster appears.
- M'Baku appears.
- Red Skull/Stonekeeper appears.
- Ebony Maw appears.
- Corvus Glaive appears.
- Cull Obsidian appears.
- Proxima Midnight appears.
- F.R.I.D.A.Y. appears.
- Ned Leeds appears.
- Happy Hogan appears.
- May Parker appears.
- Korg appears.
- Ramonda appears.
- Thaddeus Ross appears.
- Watchers' Informant appears.
- Howard the Duck appears.
- Akihiko is introduced.
- Morgan Stark is introduced.
- Avengers Tower appears.
- Asgard appears.
- New Avengers Facility appears.
- Midtown School of Science and Technology appears.
- Wakanda appears.
- Titan II appears.
- List is mentioned
- Arnim Zola is mentioned.
- Vision is mentioned.
- Budapest is mentioned.
- Harokin is mentioned.
- Ronan is mentioned.
- Maria Stark is mentioned.
- Odin Borson is mentioned.
- Bor Burison is mentioned.
- Malekith is mentioned.
- Kurse is mentioned.
- Morag appears.
- Camp Lehigh appears.
- Steve's Captain America uniforms from Captain America: The Winter Soldier and The Avengers appear.
- Captain America, Tony Stark, Hulk and Ant-Man revisit the Battle of New York in 2012 to get both the Space, Time and Mind Stones
- Rocket and Thor revisit Asgard in 2013, as the Dark Elves attack, to get the Reality Stone
- Nebula, War Machine, Black Widow and Hawkeye revisit 2014 to get the Power Stone.
- Tony's first Arc Reactor given to Pepper from Iron Man appears.
- Steve repeats the line "I can do this all day" from Captain America: The First Avenger and again in Captain America: Civil War.
- Morgan told Happy that she wants cheeseburgers and Happy told her that Tony loves Chesseburgers which is a call back to Iron Man.
- Steve tells Bucky "Don't do anything stupid until I get back" and Bucky said "How can I? You're taking all the stupid with you" are the words that Bucky tells Steve from Captain America: The First Avenger.
- Part of the journey is the end.
- Avenge the fallen.
- Nothing can prepare you for the end.
- Whatever It Takes!
The film was shot in Georgia and New York.