Smallville: Season 4, Episode 17

4 - 17: Onyx

A glimpse of the future Lex Luthor is revealed after a kryptonite explosion splits Lex in two and his evil side - Alexander - is released. Alexander immediately imprisons Lex in the mansion and begins his rampage by trying to kill Clark and Chloe in the lab, jousting with Lionel and convincing him to return to the dark side and finally, threatening to close the Talon unless Lana moves in with him...