DC COMIC VILLIAN MXYZPTLK TRIPS UP SMALLVILLE – Chloe (Allison Mack) is drawn into an underground gambling ring at school run by foreign exchange student Mikail Mxyzptlk (guest star Trent Ford) and loses her savings on a football game after Mxyzptlk uses his powers to control all the players including Clark (Tom Welling). When Chloe discovers Mxyzptlk’s secret, he kidnaps her and threatens to kill her unless Clark throws the championship game. Meanwhile, Lex (Michael Rosenbaum) threatens Mxyzptlk with deportation unless he uses his powers for Lex’s benefit.
CLARK AND LIONEL SWITCH BODIES – Clark (Tom Welling) hears a painful ringing sound in his ears and is drawn to the prison where Lionel (John Glover) is being held. When he sees Lionel attempt to stab Lex with a strange glowing stone, Clark grabs for the stone causing the two men to switch bodies. Learning his new body has super powers, Lionel immediately begins wreaking havoc on Smallville. Trapped behind bars without his powers, Clark must figure out a way to get his body and powers back in order to save his friends and family.
THE FLASH SPEEDS INTO SMALLVILLE – After Jonathan’s (John Schneider) wallet is stolen, Clark (Tom Welling) super-speeds after the thief but is stunned when he cannot catch him. The thief, Bart, a.k.a. The Flash, later shows up at the farm and tries to talk Clark into leaving Smallville for a life on the road together, flexing their super powers. Meanwhile, Lex (Michael Rosenbaum) buys a priceless framed manuscript with Kryptonian symbols and Clark learns that it contains a mysterious hidden map. However, when Bart steals the manuscript from Lex, he inadvertently puts Clark’s life in danger and must make the decision whether to save Clark or himself.
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.