Smallville :

Professor Fine unleashes a crippling computer virus that could kill millions of people via pandemonium and refuses to give Clark the vaccine unless he agrees to release the spirit of an imprisoned Kryptonian criminal. Clark turns to Lionel, who once again channels Jor-El.

Jor-El informs him that Zod needs a vessel to inhabit. Clark must destroy that vessel, and that vessel is Lex. Meanwhile, Lex is stunned by his newfound powers and shares the discovery with Lana, who decides to stand by her new man, unaware of the shocking turn Lex's life is about to take.