Episode list

Clark saves Lana from the tornado, leading Lana to be suspicious of Clark. While protecting Clark's secret, Jonathan gets trapped with reporter Roger Nixon in an underground mausoleum. Lex and Clark search for Jonathan.

When the "hot" new Biology teacher Desiree Atkins (Krista Allen) arrives in Smallville, Clark Kent gets excited in her presence and his hormonal surge sets off a new ability: heat vision. Lex Luthor meets and falls for Atkins and they decide to get married. Meanwhile, Clark's heat vision causes another fire at The Talon when Clark is talking with Lana, leading Clark to get briefly jailed on suspicions of arson. Lex invites Clark to be his best man, but when Desiree tries to seduce Clark, he realizes that she is a meteor freak with the power to seduce men.

When Dr. Steven Hamilton, physically sick from repeated exposure to meteor rock radiation, causing constant Parkinson-like twitches, becomes a liability to Lex Luthor, he terminates their contract. Dr. Hamilton leaves the mansion and drives down the road like a lunatic and causes a serious accident with a truck driven by Ray Wallace. The truck overturns in a cornfield near Clark Kent's spacecraft and, while trying to rescue Ray, Pete Ross sees the UFO. The next morning, Pete asks Clark to help him to bring the object to his workshop. When Dr. Hamilton steals the spacecraft, Pete believes Clark has taken it, so Clark discloses his secret to his friend. Meanwhile, the now blind Lionel Luthor moves into Lex's mansion forcing Lex to care for him. Also, to Lana's dismay, her aunt Nell Potter is in love with a new boyfriend named Dean.

Clark gets his Smallville class ring, but these rings contain RED KRYPTONITE making him turn into DARK CLARK.

Lana Lang finds some poems from a secret admirer in the gravestone of her parents in the cemetery. Later, she meets the author, Byron Moore, a weird teenager kept locked by his parents in the basement of their farmhouse. They believe the boy is abused by his parents, but soon they realize that he was the subject of an experiment of a laboratory of Luthor Corp, which made him powerfully evil and super-strong when he comes into contact with sunlight. Meanwhile, Martha Kent is invited to work as the assistant of Lionel Luthor, and she accepts the invitation under the reluctance of Jonathan Kent.

When the farm runs into financial troubles, Martha calls her estranged father for help. Meanwhile students at Smallville High are mysteriously aging rapidly and the school's new principal takes issue with Clark's close friendship with Lex.

A woman appears in Smallville claiming that Clark is her biological son by Lionel Luthor, and she kidnaps Lex to force a confession from Lionel. Clark demands that his parents explain what role Lionel Luthor played in his adoption.

Clark rescues mind-reading Ryan James from a research hospital that treats him like a lab rat. Ryan's guardian doctor sues to get Ryan back, and Clark learns that Ryan has a brain tumor that needs treatment.

Ian Randall is a mentally unbalanced, overachieving student desperate to succeed who gets a 'C' from his stern shop teacher John Frankle. Ian freaks out, duplicates himself and kills Mr. Frankle. The meteor-rock mutant simultaneously invites Lana and Chloe on a literal 'double date', aiming to get a scholarship from Luthor Corp to Yale by using the girls who know Lex Luther. Meanwhile, Lana moves to Chloe's house to live with her and divorced father after Nell leaves town. Clark tries to advise Lana and Chloe about the personality and ability of Ian, but he is misunderstood. Elsewhere, Jonathan breaks his leg, and Lex Luthor meets Dr. Helen Bryce, who is treating Jonathan where an immediate attraction develops between Lex and Dr. Bryce.

Clark falls into an underground cave system where Native American teen Kyla Willowbrook is researching her ancestor's cave paintings and believes Clark may be the answer, while her grandfather attempts to save the caves from LuthorCorp.

Whitney Fordman returns to Smallville unannounced and receives a hero's welcome from all but Clark who fears his return will put strain on his relationship with Lana. However, all is not as it seems as Whitney begins behaving erratically.

When Lex discovers that his father had surveillance devices planted in the mansion, he hires a group of criminals to do the same to LuthorCorp Plaza in Metropolis, unwittingly putting both Lionel and Martha's lives in danger.

Lionel Luthor is shot by an unknown assailant, leading Sheriff Ethan to suspect a drunken Jonathan Kent. As he attempts to prove his father's innocence, Clark learns that Lex and Dominic Senatori have their own motives for killing Lionel.

After attending an unauthorized rave in the caves underneath Smallville, Pete and Chloe become infected with a parasite which turns them into adrenaline junkies, threatening to expose Clark's secret and ruin his date with Lana.

Lex locates his long lost half-brother Lucas in Edge City and takes him back to Smallville as part of his plan to overthrow their father Lionel. However, Lex faces betrayal when Lucas decides to side with Lionel instead.

Attempting to hide the key to Clark's ship in the farm's storm cellar, Martha unknowingly breathes in toxic meteor rock spores and falls ill. To make matters worse, the Disease Control Agency wish to conduct a full search of the farm.

When Clark feels compelled to insert the ship's key into the slot on the cave wall, he is suddenly able to understand the cave's strange symbols and is contacted by Dr. Virgil Swann who may hold the answers he seeks about his home planet.

Following an incident in which Clark's strange new classmate Cyrus Krupp seemingly starts a fire with his eyes, Clark begins to suspect he may actually be a Kryptonian. Meanwhile, Lex's new girlfriend Dr. Helen Bryce discovers his secrets.

Clark saves Lana from a group of drunken customers at The Talon but faces scrutiny from Smallville's strict new Sheriff Nancy Adams. Lex becomes concerned when Helen's obsessive ex-boyfriend arrives in Smallville and begins following her.

Following an argument with Chloe, Clark witnesses a Smallville High student rob a LuthorCorp van transporting kryptonite. Avoiding police questioning, Clark takes matters into his own hands but unwittingly puts his family in danger.

Lana is terrified when she is seemingly visited by the ghost of her deceased childhood friend Emily. As Clark and Lana investigate, they find there may be more to Emily than meets the eye and that Lionel Luthor may have some involvement.

As Lex and Helen prepare for their imminent wedding, Clark and Lana navigate their blossoming romance. Meanwhile, linguist Dr. Walden awakens from his coma and sets out to kill Clark Kent, believing him to be a threat to mankind.

Clark is contacted by his biological father Jor-El who tells him he must leave Smallville to fulfill his destiny, just as everything is going right for him. Torn between his heritage and his upbringing, Clark must make a difficult choice.