Sentinels

Sentinels are robots created with the only purpose of destroying mutants.

X-Men: The Last Stand
A Sentinel is used as a simulation in the Danger Room in order to train the young X-Men in team play. The robotic behemoth attack Kitty Pryde, Rogue, Colossus and Iceman, with Wolverine and Storm as the team leaders. The young mutants only manage to defend themselves against the Sentinel's attack, with Logan smoking a cigar at a distance, complaining about how boring the task of a teacher is. When an explosion makes Wolverine lose his cigar, he gets angry and makes Colossus throw him towards the Sentinel, decapitating it with his claws and putting an end to the simulation.

Character traits
The Sentinels are gigantic robots disposing of many weapons and tools for hunting, tracking down and capturing and/or killing mutants. They appear as giant humanoids, dark purple colored with glowing red eyes. They possess superhuman strength and stamina and the ability to fly.

Relationships

 * Bolivar Trask - Creator.
 * William Stryker - Creator.
 * X-Men - Enemies.
 * The Brotherhood of Mutants - Enemies.

Behind the scenes

 * Although Sentinels were set to appear in every X-Men movie, they never managed to, but some sketches of their rendering for X2: X-Men United appear on the dvd extras. They appear almost the same as in the comics, with the only exception of a compact form they were meant to use for transportation.

Trivia

 * In the videogame tie-in between X2: X-Men United and X-Men: The Last Stand it is revealed that Sentinels were created by William Stryker as a part of his Weapon X project, with Bolivar Trask and HYDRA financing their construction.
 * Sentinels were supposed to appear in X-Men, used by William Stryker and Henry Gyrich against The X-Men, but they didn't go beyond the first draft.
 * Sentinels had to appear in X2: X-Men United, but didn't in the end. A sign of them can be seen on one of William Stryker's computer, in which "Project Wideawake" appears.
 * Some of Justin Hammer's armors in ''Iron Man 2 resemble Sentinels.