Baby Clark (Kal-El) arrives on Earth. Teen Clark starts high school, saves Lex's life after a car accident, and finds out about his past and birth parents.

Clark discovers that he has X-ray vision, but struggles to use it properly. Meanwhile, shape-shifter Tina Greer robs a bank impersonating Lex Luthor, and then decides that she wants to become Lana Lang - permanently.

Lana befriends Harry, an elderly murderer living incognito in a nursing home. He falls into a kryptonite pond and regains his youth. Harry starts killing descendants of the jurors who convicted him, one of whom was Jonathan Kent's father.

Clark and classmate Eric Summer are both struck by lightning while Eric is holding Kryptonite, and Clark's powers are transferred to Eric. While Clark experiences normal humanity, the emotionally challenged Eric goes on a rampage.

Martha Kent injures mind-reading Ryan in an auto accident, and he fakes amnesia to get away from his criminal step-parents. His step-parents hatch an elaborate plan to steal him back and use his abilities to rob Lex Luthor.

Lex and Lionel engage in a struggle over closing down the fertilizer plant. Reporter Roger Nixon steals Clark's spacecraft and learns his secret. Whitney joins the Marines, and Clark takes Chloe to the prom, while a huge tornado approaches.