Abigail, an ugly high school girl, gets plastic surgery from her surgeon-mother to boost her popularity. However, her beauty hides a dark secret - when she kisses someone they're inflicted with life-threatening hallucinations. When Lana sees Abigail with one of her victims, she becomes the next target.

The episode was rated 7.82 from 384 votes.

Lois accidentally hits a dog and brings it back to the farm to heal, but Clark 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 wonders what Jason is up to with his mother, and Jason is forced to ask Genevieve a few questions of his own.

The episode was rated 7.82 from 325 votes.

After Clark receives a message from the recently-deceased Dr. Swann, he and Lana follow Jason and Lex to China in search of one of the kryptonian crystals. Lana is tortured, causing Isabelle to emerge and wreck havoc in her search for the crystal.

The episode was rated 7.84 from 342 votes.

A black kryptonite explosion splits Lex in two and his evil side - Alexander - is released. Alexander imprisons Lex in the mansion then gives full vent to his evil side - he threatens to evict Lana from the Talon unless she becomes his mate, jousts with Lionel, and tries to kill Clark and Chloe when they figure out his secret.

The episode was rated 7.87 from 312 votes.

A Luthorcorp experiment is released into the atmosphere - a toxin that causes its victims to hallucinate their worst fear. Chloe, Clark, Lana, and Jason all fall fictim to the toxin, and Lex, desperate to find a cure, takes a dangerous antidote. Meanwhile, Lionel is released from prison and his conviction overturned thanks to a mysterious benefactor.

The episode was rated 7.87 from 349 votes.

Clark is approached by Met U for recruitment and meets Geoff, a former Smallville resident. It soon becomes apparent that he is using his powers to paralyze anybody who gets in his way...including Lois.

The episode was rated 7.88 from 336 votes.

Clark decides to join the football team over Jonathan's wishes and gets the starting quarterback position when his predecessor attacks Jason over a girl. Clark and Lois investigate and discover that the cheerleaders are using kryptonite in the team's water supply to turn them into obedient mindless boyfriends.

The episode was rated 7.92 from 377 votes.

Alicia (from "Obsession") is supposedly cured and returns to Smallville to start things back up with Clark. When she pushes for more and he turns reluctant, Alicia expoess him to red kryptonite, and the two go off to Las Vegas to get married. Meanwhile, Lana questions whether sex may prove the key to winning Jason back.

The episode was rated 7.94 from 359 votes.

Clark is drawn to the state penitentery by one of the kryptonian crystals, which Lionel is using to switch bodies with Lex. Clark intervenes and Lionel enters his body instead. While Lionel uses his newfound super-powers to regain his lost fortune and alienate Clark's friend, Clark must convince his parents that he is the "real" Clark and reverse the processs, while avoiding murderous convicts.

The episode was rated 7.94 from 350 votes.

After discovering that Chloe's body isn't in her coffin, Clark and Lois Lane investigate but are stopped by Lois' father, General Sam Lane. They believe General Lane knows more then he's telling, and figure out he's been in contact with Lex. Meanwhile, after Lana's sudden departure Jason follows her to Smallville. And Lionel sends a mutant killer to determine if Chloe is alive and kill her for sure.

The episode was rated 7.96 from 389 votes.

When a mysterious killer strikes at both Lana and Jason, Alicia is the leading suspect and even Clark comes to doubt her innocence. Feeling betrayed, she secretly tricks Clark into revealing his powers in front of one of his friends. And Genevieve returns to town with an offer for Lex, who in turn has an offer for Jason.

The episode was rated 8.01 from 373 votes.

Jonathan's wallet is stolen by a super-speed thief, Bart Allen, who is faster then Clark. Bart comes to the farm and becomes friends with Clark, but Bart returns to crime when he sees an ancient manuscript that Lex has. As Clark soon realizes, the manuscript holds a map to one of the kryptonian crystals and he must go up against Bart to recover it.

The episode was rated 8.08 from 380 votes.

When a boy who can make people lose their memories robs the Talon, Clark goes after him but gets total amnesia. Chloe finds out what happened and has to tutor Clark in the use of his superpowers and make sure he doesn't accidentally reveal his secret. While Clark, Chloe, and Lois try to track down Kevin, Clark takes advantage of his "new life" to ask Lana on a date. And Lex tries to turn Clark's memory loss to his advantage by getting him to reveal the secret of the caves.

The episode was rated 8.09 from 330 votes.

Clark returns to Smallville as Kal-El - intent on fulfilling his destiny, he goes after a powerful kryptonian crystal that Lex has obtained in Egypt. Meanwhile, newcomer Lois Lane arrives in Smallville to look into the death of her cousin Chloe, and Lana returns from Paris with a new boyfriend. Jonathan lies in a coma after the events of last year's season finale and Lionel must deal with his new life in prison.

The episode was rated 8.11 from 425 votes.

After a nightmare, Clark goes to the cave to confront his father Jor-El. Jor-El warns that the crystals have fallen into human hands and have triggered a new meteor shower which will annihilate the Earth unless he reunites the three crystals. Meanwhile, Lex helps Lana, who has apparently commited murder, but then turns against her to get possession of her Kryptonian stone. As disaster looms, Chloe and Lois try to find Lana while Clark attempts to reassemble the stones, and Jason returns to make things unpleasant for the Kents.

The episode was rated 8.32 from 360 votes.