In the aftermath of a tornado, Clark must find his missing father. Jonathan tries to keep Nixon from revealing the family secret, while Lex makes a fateful decision for his father.
Clark attempts to keep his secret hidden from his best friend after Pete discovers the missing spacecraft. A former LuthorCorp scientist gets closer to the truth about the ship.
Lana is entranced by a young man who leaves poetry for her at her parents' grave site. But she and Clark discover that his parents keep in chained in their basement.
Martha approaches her estranged father for help after learning that the family farm is in financial trouble. Lana discovers that her biological father may still be alive.
Clark confronts his parents about the truth behind his adoption when a woman shows up claiming to be his birth-mother. Lana approaches the man she believes may be her father.
Clark helps his young friend escape a facility where he is being studied for is telepathic abilities, but learns that he may not be able to save him from an even bigger threat.
Whitney's unexpected return to Smallville signals danger for more than just Clark's relationship with Lana. Lex becomes suspicious of his new girlfriend.
Martha falls deathly ill after exposure to meteor rock-infected mold spores. And when Clark begins to exhibit similar symptoms, Jonathan must take matters into his own hands to save his family.
A fantastical event at the cave gives Clark the ability to read the alien language, pushing him to seek out a world-famous scientist for information about his secret origins.
Clark meets a young man who believes himself to be an alien, and is hesitant to believe him -- until he demonstrates super abilities. Lex reveals his secret project to Helen.
Lex takes the law into his own hands when Helen's ex-boyfriend begins stalking her. Clark defends Lana from a bully, only to find himself being sued for injuring the man.
Jocks from Smallville High use airborn meteor dust to gain super strength. But when they find that they are unable to beat Clark, they target his parents. Lionel Luther makes a surprising offer to Chloe.
Lana is stunned when she comes face to face with her best friend, who died as a child. Lex discovers that his father has been funding meteor rock research.
Clark's burgeoning romance with Lana is interrupted by a voice declaring Clark's destiny to rule the Earth. Dr. Walden awakens with incredible powers, and tries to kill Clark to save the world.
