Khan Noonien Singh or simply, Khan was an extremely intelligent and dangerous superhuman. He was the most prominent of the genetically-engineered Human Augments of the late- 20th century Eugenics Wars period on Earth. Khan was considered, by the USS Enterprise command crew, over three centuries later, to have been "the best" of them. Reappearing with a cadre of Augment followers in the 23rd century , Khan became a notorious enemy of James T. Khan's existence as an Augment served, as well, as a warning to society of the danger in attempting to create "supermen" through technological means. Ambassador Spock stated that he was the most dangerous adversary the Enterprise ever faced.