When the most infamous villain in Star Trek history is last seen in the Original Series episode "Space Seed," Khan Noonien Singh's an elegant, proud warrior-king. When he's next seen in Star Trek II: The Wrath of Khan, he's a grizzled maniac, twisted by loss and an unquenchable thirst for revenge. What has happened between these two points in time to so radically alter what seemed to be an unbreakable will?