However, as soon as mutants travel there, they are captured and fitted with power-negating collars placed around their necks ; they are put to work building Sentinels for the Genoshan government, under the direction of Bolivar Trask, Cameron Hodge, Henry Peter Gyrich, and a government official known as " the Leader.

Genosha continues to enslave mutants employing Sentinels and Magistrates, until they are rescued by Magneto and his Acolytes with the aid of many mutants ( examples being Random, Arclight, Tar Baby, Blockbuster, Peepers, the second Shocker, and even Gambit, the Beast and Professor X ).

Sentinels are a fictional variety of mutant-hunting robots, appearing in the Marvel Comics Universe.

According to Marvel canon, Sentinels are programmed to locate mutants and capture or kill them.

Sentinels are designed to hunt mutants who often represent the protagonists of Marvel stories ; therefore, the sentinels are usually employed as supervillains or as the tools of other villains.

Sentinels are technologically advanced, and have exhibited a wide variety of abilities.

* Bio-Sentinels-Humans infected by a technological virus created by Simon Trask, the victims become anti-mutant activists, who later at Trask's command, are fully transformed into robotic Sentinels mindlessly following Trask's commands.

The following are alternative versions of the Sentinels, which appear outside of regular Marvel canon.

These Sentinels are equipped with several body-mounted gun turrets, and their primary directive is to protect humans rather than to hunt mutants.

In the joke comic Fred Hembeck Destroys the Marvel Universe, the X-Men are killed by silent, black, man-sized " Ninja Sentinels ".

These are aesthetically similar to regular Sentinels, but each is subtly different from the others.

*" What if ... starring Secret Wars: 25 years later " the children of heroes are teleported back to earth where sometime in the last 25 years, a variation of " Days of future's past " is shown when the group is attacked by Sentinels

These Sentinels are much more powerful and heavily-armed than their comic book counterparts.

Three upgraded Sentinels are later used by S. H. I. E. L. D.

In " Badlands ", Sentinels called Trackers ( based on Wolverine ) are produced and able to used laser claws and can heal themselves.

The Sentinels are controlled by Master Mold.

There are two types of Sentinels: one is a smaller, aerial model ; and the other is a giant walking behemoth.

In most games, the Sentinels are human-sized foes rather than the massive figures that are seen in most of their comic book appearances:

* Sentinels are seen in Cyclops / Spider-Man's level in X-Men: Mutant Academy 2.

There are several versions of the Sentinels in this game:

* In X-Men Legends II: Rise of Apocalypse, the Sentinels are shown assisting with the evacuation after Apocalypse devastates New York City.

Due to the tampering of Bastion and his Sentinels, the X-Mansion computer system Cerebro gains autonomy and seeks to destroy the X-Men by employing its knowledge of the Xavier Protocols.

However, the entire island was reduced to rubble and its mutant population was slain by Cassandra Nova's Sentinels.

" With the help of Cable and a flood orchestrated by Storm, the X-Men simultaneously free the mutant slaves and destroy the Sentinels.

Later, as he was checking on Emma Frost who was in a comatose state after the mutant Trevor Fitzroy unleashed the mutant-hunting Sentinels on Emma Frost and her students known as the Hellions, the mansion was hit by an electricity breakdown.

On the way back, they found that the O * N * E * Sentinels guarding the Xavier Institute had become infected by nano-Sentinels and attacked the school.

In 2009, the Sentinels were ranked by IGN as the 38th Greatest Comic Book Villain of All Time.

* Composite-created by merging the remaining portions of five Sentinels destroyed by the X-Men and came under control of Ashley Martin.

* Tri-Sentinel: A combination of three fairly standard Sentinels bonded together by Loki, and defeated by Spider-Man at the peak of his cosmic ( Captain Universe ) powers.

* Soviet Sentinels: Created by the Soviet Union and later purchased by Cuban government officials.

* Colcord's Sentinels: Some of the Boxbots created by Madison Jeffries ( aka Box ) to serve the Weapon X Program.

In Ultimate X-Men, the Sentinels, created by the Ultimate Marvel version of Bolivar Trask, were already in action at the beginning of the first story arc, hunting down and killing mutants on the streets, in a program apparently openly and publicly acknowledged by the U. S. government.

William Stryker, Jr. using Sentinel Tech, later displayed an ability to summon a fleet of Sentinels after being attacked by the Shroud.

* Sentinels appeared in a number of episodes of the X-Men animated series voiced by David Fox.

* Sentinels have appeared in the Wolverine and the X-Men animated series voiced by Jim Ward.

Alongside Sebastian Shaw, Lourdes Chantel, and Harry Leland, Emma battles Lang's Sentinels.

Sebastian has generally acted as a hero, working with the Outsiders, Justice League, and Sentinels of Magic.

Ironically, Shaw was for years a major supporter and builder of Sentinels, figuring that it's better to be in control of them than not.

" Approaching him later in his cell, Emma reveals that she has captured Shaw for Namor and on the basis that the Sentinels he commissioned were ones later used by Cassandra Nova to destroy Genosha.

Shaw, using his connections to Senator Robert Kelly to initiate Project: Wideawake, secured a government contract for Shaw Industries to manufacture Sentinels, profiting from the state of fear concerning the " mutant menace " despite secretly being a mutant himself.

" Approaching him later in his cell, Emma reveals that she has captured Shaw for Namor and on the basis that the Sentinels he commissioned were ones later used by Cassandra Nova to destroy Genosha.

However, Zemo is also secretly working with Shinobi Shaw and Psylocke as part of a new Hellfire Club to bring about the Sentinels ' downfall.