Sentinel MK I

The Sentinel MK II is a fictional model series of robot featured in comic books published by Marvel Comics. They are part of the mainstream Marvel Universe, colloquially referred to as the Earth-616 reality, but have also been represented in stories that take place in alternate realities as well. They are traditionally associated with stories dealing with the X-Men. The Mark II Sentinels were first introduced in The X-Men, Volume 1 #14 in November, 1965.

Scientist Doctor Bolivar Trask created the MK I line of Sentinels as a robotic deterrent to what he felt was the growing threat of mutant supremacy. When Charles Xavier learned that Trask was petitioning the U.S. government into pressing these robots into service, he attempted to nip things in the bud by having a live televised debate with Trask. During Trask's demonstration, one of the Sentinels malfunctioned and attacked its creator. They also ended up abducting Xavier's students, the X-Men.