Clark finally embraces his future with the creation of the Fortress of Solitude in the Arctic, and returns to Smallville to find that a pair of Kryptonian villains have arrived and are searching for him.
A gang of superpowered criminals escape from Belle Reeve and take Lana and the Kents hostage, demanding that Clark break into Lex's high-security facility -- without his abilities.
A friend of Chloe's takes control of a missile silo and targets it to destroy Smallville. Clark faces his mortality -- and his destiny as Jor-El's son -- when he is shot.
Lois falls for a man with superhuman swimming abilities after he rescues her. But Clark doesn't trust him, and soon learns that he is on a mission to take down Lex Luthor's new underwater weapons program.
Lana is forced to join a sorority when she heads off to college, but is transformed into a vampire by its blood-sucking members. Clark is caught in the feud between his new professor and Lex Luthor.
Chloe and Lois investigate the murder of a nightclub dancer, forcing Lois to go undercover as a dancer herself. An old friend of Jonathan's asks for help in his Senate reelection campaign, only to be connected to the dead girl.
Clark is plagued with paranoid delusions when he is exposed to silver kryptonite, and is convinced that everyone he cares about is turning against him. A new ally reveals himself.
When Martha Kent contracts a Kryptonian disease that will kill her within hours, Professor Fine convinces Clark that the only way to save her is to turn on Jor'El and destroy the Fortress of Solitude.
Lex dreams of a happier, middle-class life -- married to Lana -- after he is shot in an alley. Clark agrees to use his super speed to deliver Christmas presents to needy kids.
Lex Luthor and Jonathan Kent run against each other in a Senate election, but one of Lex's devoted followers from the local university has her own plans for getting her idol elected. Clark reconsiders his physical relationship with Lana.
A pair of Smallville police officers go after Lex Luthor, demanding that he hand over the alien ship he seized after the last meteor shower and trapping him in his panic room.
Clark befriends Victor, the unwilling victim of a cybernetics experiment at LuthorCorp, but Lex wants him back. Meanwhile, Martha may be the target of blackmail. (TV Guide)
Clark is hypnotized by a beautiful woman, and reveals his abilities to her when she commands him to do her every whim. Lex gets a lead on the whereabouts of Milton Fine.
Lana seeks a kryptonite drug developed by an ambitious medical student in order to have a near-death experience and see her parents again. Clark learns an important secret about Lionel Luther.
Clark receives disturbing instructions from the ghost of his father -- to kill Lionel Luther. Milton Fine learns that Lex is planning to double-cross him.
When Milton Fine abducts Lex and returns him with super powers, Clark's Kryptonian father tells him that he must kill his old friend to prevent the return of Zod and the end of human civilization.
