After Lana is almost assaulted by a college student, Clark injures the boy while helping her. When the Kents are sued for damages that could cost them the farm, Clark tries to find a way out of the lawsuit. Meanwhile, Helen's obsessive...

After a schoolmate claims to be an alien and proves it by using heat vision, Clark investigates and believes the boy is from Krypton. Meanwhile, Helen confronts Lex over the locked room in the mansion that holds his investigation of Clark&#...

Clark travels to New York to meet Dr. Swann, a brilliant scientist who holds a message for Clark from his home planet. Meanwhile Lana decides to move out of Chloe's house after they get into an argument about Clark.

Martha catches a lungful of kryptonite-irradiated spores and slips into a coma. Clark, who temporarily loses his powers by breathing in the same spores, is her only hope for survival. Lex sneaks behind Helen's back at the hospital in h...

Lex recovers his long-lost brother Lucas and uses him in a ploy to buy out his father's share of the company. But it soon becomes clear that Lucas isn't to be trusted, and Lex soon finds himself ousted from his own company.

Students are engaging in wild, sometimes suicidal stunts, and Chloe and Pete are the next ones to become "infected"...and they use a piece of red meteor rock to get Clark to join them.

Lionel is shot in the manor, and Jonathan is the prime suspect.

Lex hires some thugs to bug Lionel's office but things get out of control when Lionel and Martha are taken hostage, and Clark must rescue them without revealing his secrets.

Whitney returns to Smallville, eager to start back up where he left off with Lana. But everything isn't what it seems... Meanwhile, Lex gets suspicious with his relationship with Dr. Bryce, only to find that she has been having meeting...

Clark becomes involved with a Native American woman, Kyla, and becomes aware of ancient Indian prophecy that warns of a man of great powers who fell from the sky. Worse, a wolf-like creature is attacking the local Luthorcorp construction pr...

A Smallville student, Ian, displays the ability to make clones of himself and uses his power to date both Choe and Lana. Meanwhile Lex goes to anger management class and meets an attractive local doctor.

Ryan (from "Stray") returns and Clark has to save him from Dr. Garner of the Summerholt Research Facility. Meanwhile, Aunt Nell leaves Smallville, and Lex wants to expand the plant but runs afoul of the mayor.

A strange woman shows up claiming to be Clark's biological mother...and that his father is Lionel. Meanwhile Lana decides to meet with the man who is her biological father.

Martha's father William comes to town after many years of estrangement due to his disapproval of Jonathan. Meanwhile Clark must deal with a series of old-age deaths at Smallville High, and the new principal puts his foot down.

Lana has a new stalker - a boy imprisoned in his basement by his parents who sneaks out at night to visit her. Meanwhile Lionel hires Clark's mother as his personal assistant.

Clark has his first run-in with red kryptonite in this exploration of classic Superman mythology, turning immoral when he gets his high-school ring holding a piece of rock. Meanwhile, Lex and his father have some issues to resolve when Lion...