Sentinel MK I
Introduced in 1965’s X-Men #14, the early Sentinels still held design ideas and philosophies that have continued to persist throughout legions of iterations since. Their trademark purple-hued color scheme hadn’t kicked in quite yet—nor had their giant scale, appearing just a little larger than your average person.
Developed by Bolivar Trask as a way to safeguard humanity from his bigoted perception of the mutant “threat,” the first Sentinels were actually just as deadly to humans as they were mutants. The Sentinels were controlled not by their human “masters,” but an artificial intelligence—one that deemed that ultimately the best way for humanity to be protected was for them to directly control its existence.