MODOK, short for Mental Organism Designed Only for Killing, is one of Marvel's most recognizable supervillains. Originally George Tarleton, he was transformed by A.I.M. experiments into a massive-headed being with unparalleled intelligence and devastating psionic abilities. After overthrowing his creators, MODOK became the ruthless leader of A.I.M. and repeatedly clashed with heroes such as Captain America, Iron Man, and the Avengers. His brilliant mind and relentless ambition make him one of Marvel's most dangerous scientific masterminds.