Khan Noonien Singh, also known as John Harrison, is an extremely intelligent and ruthless terrorist, and was the most prominent of the genetically engineered Human Augments of the late-20th century Eugenics Wars period on Earth. Considered genocidal tyrants who conquered and killed in the name of order, Khan and his kind were frozen in cryogenic-sleep. In the 23rd century, Khan was revived by Admiral Alexander Marcus to design weapons and ships to prepare for war against the Klingon Empire.