Clark makes an astonishing discovery about his origins, leaving him facing the choice of a...
A linguist who was injured while studying the caves comes out of his coma and discovers he...
Lana becomes convinced she is being haunted by the ghost of a dead friend, but does not suspect...
Clark encounters an audacious teenage robber who inhales Kryptonite fumes from a respirator to...
An old flame begins to stalk Helen, prompting a concerned Lex to take direct action to stop him...
Clark investigates the background of a new student who claims to be an alien and to prove it...
Lana moves into the Luthor mansion, while Clark sets out to discover where he came from,...
Martha inhales green meteor-irradiated spores and promptly lapses into a coma, while Lex learns...
Lex rescues his long-lost brother Lucas from the tender mercies of crooks with murder in mind,...
Alien parasites infect Pete and Chloe, transforming them into irresponsible thrill-seekers and...
Clark battles to overturn seemingly incontrovertible circumstantial evidence and clear his...
Lex hires crooks to bug his father's office, but they take Lionel and Martha hostage and break...
Whitney returns home from the Marines hoping to rekindle his relationship with Lana, but his...
Clark befriends a Native American girl, who guesses his secret but jumps to the wrong...
Clark tries to warn Lana and Chloe about a student who is surreptitiously dating both of them,...
Clark tackles a murderous student who has created a clone to do his dirty work. Jonathan breaks...
Clark tries to protect his friend Ryan from an evil doctor determined to exploit his strange...
A woman claiming to be Clark's biological mother arrives in Smallville, causing conflict...
Clark sets up a reunion between Jonathan and his grandfather. An old photograph reveals that...
Martha goes to work as Lionel's personal assistant, while Lana pointedly turns a deaf ear to...
A mysterious red meteorite causes Clark to become rebellious and start using his powers for...
Pete Ross discovers Clark's spaceship while helping the victim of a rural hit-and-run incident...
Clark struggles to control his newly developed power of heat vision, while Lex marries...
Clark rescues Lana from the tornado and discovers the storm has activated his spacecraft and...