i don't know khan , so i'm going with Nero

Khan is a superhuman tyrant who once controlled more than a quarter of the Earth during the Eugenics Wars. After being revived in 2267 by the crew of the Enterprise, Khan attempts to capture the starship, but is thwarted by James T. Kirk and exiled on Ceti Alpha V to create a new civilization with his people.The character returns in the film Star Trek II: The Wrath of Khan,in which Khan escapes his imprisonment and sets out to seek revenge upon Kirk

Khan is just too classic

KHAAAAAAAAAAN!! KHAAAAAAAAN!!