CHLOE HELPS CLARK LEARN ABOUT HIS SUPERPOWERS AFTER HE LOSES HIS MEMORY – Kevin, a boy who has the power to wipe out people’s memories temporarily, turns his powers on Clark (Tom Welling) and accidentally causes him to have total amnesia. Chloe (Allison Mack) looks after him and teaches him about his superpowers while simultaneously trying to keep them secret. On his trip down memory lane, Clark meets Lana (Kristin Kreuk) and falls in love all over again. Lex (Michael Rosenbaum) takes advantage of the situation and attempts to unravel some secrets.
LIFEHOUSE ROCKS THE SMALLVILLE PROM – On the eve of the Smallville High School Prom, stuck-up candidate for Prom Queen Dawn Stiles is pulled into a coma when she crashes her car into a ravine filled with kryptonite. While her body lies in a coma, Dawn finds that her spirit can possess the bodies of others. To continue her quest to become Prom Queen, Dawn possesses the bodies of Martha (Annette O’Toole), Lana (Kristin Kreuk), Lois (Erica Durance), and Chloe (Allison Mack) in turn, leaving Clark bewildered at the abrupt personality change of his family and friends.
LOIS LANE’S SISTER, LUCY, COMES TO TOWN – Lucy Lane, Lois’ (Erica Durance) younger sister, comes to Smallville but Clark (Tom Welling) catches her stealing money from the Talon to pay off a European crime syndicate. Lex (Michael Rosenbaum) offers to help but everything is not what it seems. Meanwhile, a thief breaks into Lana’s (Kristin Kreuk) apartment and steals the crystal, and Jason (Jensen Ackles) suspects Lionel (John Glover).
SUPERDOG TO THE RESCUE – Lois (Erica Durance) accidentally hits a dog and brings it back to the farm to heal, but Clark (Tom Welling) quickly realizes it has super-strength. He investigates and discovers it was part of an aborted LuthorCorp experiment…and that robbers are using the dogs to help them steal money. Meanwhile, Lana (Kristin Kreuk) wonders what Jason (Jensen Ackles) is up to with his mother, and Jason is forced to ask Genevieve (Jane Seymour) a few questions of his own.
CHRIS CARMACK (“THE OC”) GUEST STARS – Clark (Tom Welling) is approached by Metropolis University for a football scholarship and meets Geoff, a former outstanding Smallville High player who gives Clark a taste of the luxurious life as a football star. However, Geoff is revealed to be a meteor freak and is secretly using his abilities to gain an unfair advantage on the field. Clark reconsiders his plans to pursue football in college. Meanwhile, Lana (Kristin Kreuk) gets upset over Lex’s (Michael Rosenbaum) investigation into Genevieve (Jane Seymour). She confronts Lex, who gives her a reason to reconsider her trust for the Teagues.
LANA IS ATTACKED AND ALL FINGERS POINT TO ALICIA – When a mysterious killer strikes at both Lana (Kristin Kreuk) and Jason (Jensen Ackles), Alicia (Sarah Carter) is the leading suspect and even Clark (Tom Welling) comes to doubt her innocence. Feeling betrayed, she secretly tricks Clark into revealing his powers in front of one of his friends. And Genevieve (Jane Seymour) returns to town with an offer for Lex (Michael Rosenbaum), who in turn has an offer for Jason.
JANE SEYMOUR GUEST-STARS – Lex (Michael Rosenbaum) is accused of killing a young woman and suspects that Lionel (John Glover) is behind it. Lionel, whose liver has miraculously healed, claims to be a new man and aids Clark (Tom Welling) in finding the person responsible for framing Lex. Meanwhile, Jason’s (Jensen Ackles) mother, Genevieve (Jane Seymour), comes to town to visit her son and his new girlfriend. Jason suspects her motives and worries that his seemingly accidental meeting with Lana (Kristin Kreuk) in Paris might have been all a set up by his mother.
A WITCH HUNT IN SMALLVILLE – After Lana (Kristin Kreuk) reads from a spell book written in the 1600s, she, Lois (Erica Durance) and Chloe (Allison Mack) become possessed by witches that had been burned at the stake. The three witches have come back seek revenge and search for the powerful Kryptonian crystals, wreaking havoc on the town in the process. Clark attempts to stop the witches but they strip him of his powers and force him to reveal the location of the crystal he hid in the cave.
THE STEPFORD BOYFRIENDS COME TO SMALLVILLE – Clark (Tom Welling) joins the football team at school and is immediately given the starting quarterback position after the old quarterback starts a fight with new coach Jason. (Jensen Teague) Curious about the behavior change in his old teammate, Clark and Lois (Erica Durance) investigate and discover that the cheerleaders are poisoning the teams’ water with Kryptonite, turning the players into Stepford-like boyfriends.
PLASTIC SURGERY HITS SMALLVILLE – Clark (Tom Welling) faces a surprising new foe in the form of a shy high school girl (guest star Brianna Lynn Brown) who turns to plastic surgery to enhance her looks and boost her popularity. However, things go awry when she discovers that her Kryptonite – enhanced beauty causes harm to anyone she kisses – and she decides her next victim will be Lana (Kristin Kreuk). Meanwhile, Jason (Jensen Ackles) and Lana continue to hide their relationship from Clark.
CLARK AND LOIS INVESTIGATE CHLOE’S MURDER – Clark (Tom Welling) and Lois Lane (Erica Durance) investigate Chloe’s (Allison Mack) apparent murder, but are stopped by an army officer, General Sam Lane (guest star Michael Ironside), who turns out to be Lois’ father. Lois suspects that Sam knows more about Chloe’s death than he will admit, and Clark discovers that Sam has recently been in contact with Lex (Michael Rosembaum). Jason (Jensen Ackles) arrives from Paris and convinces Lana (Kristin Kreuk) to continue their relationship. Suspecting that Chloe is still alive, Lionel (John Glover) sends an assassin with the power to morph his limbs into metallic weapons to keep Chloe from testifying against him.
LOIS LANE HITS SMALLVILLE AND CLARK FLIES! – Clark (Tom Welling) returns to Smallville re-programmed as Kal-El. Intent on fulfilling his destiny, Kal-El takes to the skies to steal a powerful Kryptonite crystal. Determined to save her son, Martha (Annette O’Toole) turns to Dr. Swann’s emissary, Bridgette Crosby, and learns about a surprising new form of Kyptonite. Meanwhile, Lois Lane (Erica Durance) comes to town to investigate the murder of her cousin Chloe (Allison Mack). Also, Lana (Kristin Kreuk) returns from Paris with a new attitude and a new boyfriend, Jonathan (John Schneider) lies in a coma, and Lionel (John Glover) faces a grim new life in prison.
Promotional images of the cast for the fourth season of Smallville.