Under the influence of red kryptonite and living in Metropolis, Clark gets involved with a crime lord named Morgan Edge who hires him to break into LuthorCorp. Meanwhile, desperate to put his family back together, Jonathan takes drastic measures to bring Clark home. At the mansion, Lionel accuses Helen of killing Lex...

After Jor-El grants Jonathan temporary superpowers, he and Clark engage in a destructive battle atop the LuthorCorp building. Meanwhile, Lex returns home and must determine whether it was Lionel or Helen who arranged his plane crash...

Clark discovers someone is hunting people affected by the kryptonite rocks and the killer's next target is Lex. Clark uses his powers to save Lex, but is caught off guard when the killer learns his weakness and shoots him with a kryptonite bullet...

Clark dreams he is being pursued by a frightened young girl who needs his help. However, after he discovers she is actually a comatose neighbor who should have woken up years ago, he enlists Lana's help to uncover the truth - which puts Lana in grave danger. Meanwhile, Lionel demands that Lex undergo a full psychological evaluation before he hires him...

Perry White, a once- promising journalist whose career was destroyed by Lionel Luthor, arrives in Smallville in search of alien stories for a tabloid news show. In spite of being constantly inebriated, Perry believes he has witnessed Clark using his extraordinary speed, so he devises a dangerous scheme to expose Clark's superpowers. Meanwhile, Lex learns that Perry has powerful incriminating evidence of Lionel's shady past...

Lana's great uncle, who was convicted of murdering his wife forty years ago, shows her a picture of the man he believes really killed her aunt, and she is shocked to discover the drifter looks just like Clark. Sure that the man is Jor-El, Clark's investigation leads him to a kryptonian medallion that allows him to see bits of the past and the life that Jor-El started for him long before he arrived on Earth...

Clark is suspicious when Lana suddenly becomes attracted to a fellow student and begins to act rebelliously, which eventually lands her in jail. Clark's suspicions are confirmed when he discovers Lana's new boyfriend has magnetic powers that can move objects and alter human emotions, but when he tries to free Lana from the paranormal hold that is controlling her, she tries to kill him...

Lex locates Morgan Edge and gets him to admit to dirty dealings with Lionel, but before Lex can take it to the authorities, someone tries to kill him at the mansion. Barely surviving, Lex flees and asks Clark for help. However, when Clark returns to the mansion to investigate he finds nothing amiss, and begins to wonder if it really happened, especially after Lionel announces Lex has had a psychotic break and must be institutionalized...

Lex teams up with three krypto-villains to lure Clark to the hospital to enlist his help in escaping after he hears that Lionel has requested Lex be given electroshock therapy to erase his memory. However, the plan goes awry when the villains double-cross Lex and use kryptonite to steal Clark's powers. Meanwhile, Lana meets a mysterious new stranger in the hospital...

Attempting to stop a robbery, Clark is temporarily blinded when he shoots off a burst of heat vision that is reflected back into his eyes by a piece of kryptonite. He soon realizes that his body has developed super-hearing to compensate for his lack of sight. However, as it was in the beginning with his other gifts, Clark doesn't quite have his new power under control...

Clark and Lana each make an attempt on Chloe's life for unknown reasons after they receive a mysterious e-mail from the Sommerholt Institute. Clark must discover the source of these e-mails after Chloe reveals she has uncovered proof that they are doing mind-control research at the lab and realizes they must be trying to kill her in order to prevent her from writing an expose. Meanwhile, Lana decides to rent the apartment above the cafe to Adam even though she feels he is hiding something dangerous about his past...

Clark discovers that his schoolmate Jordan can foresee the future, but is horrified when Jordan tells him he sees Lana dying in a fire in the next few days. Meanwhile, suspicious of his behavior, Chloe investigates Adam's background and discovers some disturbing news.

After Pete purposely blows a street race, the thugs that run it threaten his life, so he asks Clark to use his powers to stop them. Furious that Pete would put himself in this position, Clark must figure out a way to save Pete and still protect his secret. Meanwhile, Jonathan begins to suffer the consequences of his deal with Jor-El and Lex discovers that Adam's doctor is treating him with a dangerous experimental drug...

Clark is forced to use his powers in front of Alicia, a new girl at school, but he is surprised to find out she has powers of her own. The two develop a bond through their shared secret, but things turn ugly after Alicia becomes obsessive about sharing Clark with anyone else -- especially Lana. Meanwhile, Lana asks Lex to investigate Adam...

While his father is awaiting life-threatening heart surgery, Clark befriends a young boy, Garrett, whose brother Vince just died from liver failure. However, everyone is shocked when Vince shows up at the hospital alive and seemingly well -- until his liver starts failing again. In a desperate attempt to keep his brother alive, Garrett straps a Kryptonite bomb to himself and demands that Vince be given Jonathan's liver or he will blow up the building...

Clark receives a panicked call from Lana and hears a gunshot before the line goes dead, but when he arrives at the Talon he is stunned to discover she is alive and well. Clark realizes the phone call came from the next day and that Adam is the one who will shoot Lana...

When Jonathan begins to act strangely, Clark believes Jor-El is sending Jonathan messages through the key and is the cause for his father's withdrawal from the family. Clark goes down to the caves to confront his biological father but Lionel catches him there and begins putting the pieces together - leading him straight to Dr. Swann. As the two billionaires face off, a deal is struck and Lionel's true motives are revealed...

When Chloe accidentally inhales a mysterious krypto-gas, she discovers it acts as a truth serum to anyone who comes in contact with her and decides to take advantage of her new power by going to the Kents to find out Clark's secret. However, her new power comes with fatal consequences and Clark must find an antidote before she discovers the truth about him or worse, dies...

Believing that key information about his father's past was lost when his memory was erased, Lex decides to join an experimental program with Dr. Garner to regain the information so he can turn his father over to the FBI. Knowing that Lex will discover his secret if he regains his memory, Clark tries to stop him but is caught by Lionel and the doctor and exposed to the same radical treatment so that Lionel can solve the mystery of Clark's past...

When a Kiwatche Indian steals a mythic knife from the caves, he is bestowed with superpowers similar to Clark's, causing the young man to believe he is the legendary Naman, 'the man who fell from the stars'. Clark learns the Kiwatche legend foretold of a knife that could kill Naman and sets out to reclaim it before the young Indian can use it on Lionel...

Clark decides to tell Lana his secret so they can finally be together. Meanwhile, an errant FBI agent kidnaps and tortures Pete to try and force him to reveal Clark's secret. Also, Lex panics after the FBI gives him 24 hours to turn over information on his father or face jail time, but help arrives from an unexpected source...

Things come to a head in Smallville when Kara, a beautiful girl with superpowers, who claims to be from Krypton, comes to entice Clark to fulfill his destiny. Overwhelmed, Clark turns to his parents for advice but is shocked when Kara forces Jonathan to finally reveal the deal he made with Jor-El. Also, Clark makes a discovery that ultimately redefines his relationship with Lex, and Clark's relationship with Lana takes a final turn...