Episode list

Three months after joining Jor-El, Clark crash lands back on Earth with no memory of who he is but he is found by Chloe's cousin Lois Lane who is investigating her cousin's death. Lex finds an artifact with links to Krypton in Egypt.

Believing that Chloe is alive, Clark and Lois search for her but find themselves followed by Lois's father General Sam Lane who Clark comes to realize is working with Lex. Lana returns to Smallville following the bizarre events in Paris.

Smallville High student Abigail Fine undergoes experimental surgery to change her appearance but develops an ability that affects those she kisses. Clark defies Jonathan to join the football team, whose new coach is Lana's boyfriend Jason.

The Smallville High cheerleaders are using a kryptonite mixed love potion to seriously change the behavior of their victims.

Clark meets a young man with a power of speed that exceeds his own, but the boy lacks responsibility for his actions. Also, Lex finds a manuscript that appears to be some sort of Kryptonian map.

Lionel Luthor, using one of the Kryptonian stones, attempts to swap bodies with Lex but inadvertently transfers bodies with Clark, leading to him learning a few secrets, including that of Clark's powers.

A mysterious bookie with powers of manipulation has a strange, even dangerous, effect on Clark and his friends. Meanwhile, Lex causes friction by using his influence on Jason and Lana's relationship.

In 1604, in southern France, Lana Lang's distant ancestor Countess Margaret Isabel Thoreau and two other evil witches are condemned to be burned at the stake by Magistrate Wilkins, but Isabel manages to spit her blood on a symbol on a page of their mighty book of spells. In the present day, Lana buys the book on eBay, and by touching the blood-spotted symbol, resurrects the evil countess who possesses her body. Isabel/Lana uses a spell to let the other two witches posses Chloe and Lois. The powerful trio vows to pursue its quest for the three (actually Kryptonian) magical stones which can bring them unseen power. The trio enters a 'surprise' birthday party for Chloe in the barn of the Kent Farm and Isabel throws a spell to make the spectacle really hot, so Clark is one of many boys dancing and drinking in boxer-shorts when his appointment arrives, a representative from Princeton University, who is impressed in a way which can't amuse Clark's parents. The vicious witches cast spells against Jason, who is thrown out of a window but caught just in time by Clark, and Lex, who is made to play the piano constantly so his fingers start bleeding till Clark shoves the piano away, and even to draw the super-power from Clark.

Lex gets wrapped up in a sex/murder scandal. Clark gets Lionel's help to get Lex out of trouble. Lana meets Jason's mother, whom she has seen before in a dream, which was set in the 1600s.

After an explosion at a LuthorCorp lab, Smallville's citizens "relive" their worst nightmares.

Alicia Baker returns, and with the help of Red Kryptonite, elopes in Las Vegas with Clark. Lana offers a sexual relationship to Jason in an attempt to win him back. Lionel comes back to Lex with a peace offering.

Clark rekindles his romance with Alicia but his friends and family feel uneasy about their relationship and her return to Smallville. When Lana is attacked by a mysterious assailant from behind closed doors, Alicia is the prime suspect.

As Chloe begins to see Clark in a new light after witnessing his abilities, a star football player from Metropolis University arrives in Smallville to convince Clark to take up their offer of a scholarship. Lex offers Jason a new job.

When Lois hits a dog with her car, she takes him back to the Kent farm where Clark discovers he has super strength that matches his own. Two brothers are desperate to get their hands on the dog, but for what purpose?

A dying Virgil Swann urges Clark to make contact with Jor-El who sends him on a quest to retrieve three Kryptonian stones of knowledge. Lex and Jason are already searching for a stone in China for their own purposes and behind Lana's back.

The Kents are surprised when Lois's sister Lucy arrives at the farm looking for a place to stay but Clark discovers she is on the run from Swiss loan sharks with whom Lex has past dealings. Jason is alarmed to find the stone is missing.

A LuthorCorp experiment involving black kryptonite ends in failure, causing Lex to be split into two, his good half and his evil half. Clark must find a way to reverse the process before the evil Lex achieves world domination.

It's almost graduation, and that means it's time for the prom. After a car accident, a meteor-infected student in-the-run for Prom Queen starts body-swapping. Meanwhile, a dead body is found on Lex's mansion grounds.

Kevin Grady commits thefts and uses his superpower to delete the incident from witnesses' minds. When he does so with Clark who stopped him after robbing The Talon, much more memory gets wiped, so Chloe must take super-boy home to the Kent farm and help him remember who he is, including discovering together the amazing extent of his superpowers and his feelings for Lana Lang. Meanwhile Lana tells Jason she's neither sure she still wants to go to college nor to stay his girlfriend, claiming it's not Clark but their complicated past, he walks off angry, warning she doesn't realize how much he has been protecting her. Clark and Chloe trace a motor-park pass Kevin dropped to his home, or rather to his father Lawrence Grady, and gradually discover Kevin is in memory manipulation therapy with him in Summerholt neurological institute, where Lex once was a patient, for a hunting accident killing his brother Dillon but escaped. Clark helps Kevin...

In the middle of the night on the road, a young pregnant woman is going into labor while the father of her child drives, when she suddenly glows and implodes, while the guy stops the car and runs for his life. Lana and Clark are driving a truck along the same road and find a baby in the crater created by the explosion. They take the baby to the hospital, and the Kent family temporarily guards him, who is connected to Clark. Lana and Clark give the name of Evan, and on the next day, he becomes a teenager, precociously aging. The scientists of Lex study the case and conclude that the boy needs a transfusion of the bone marrow of his unknown father, if he can be found, and even then... Clark tries to save Evan. Meanwhile, Genevieve Teague has a meeting with Lionel Luthor and threatens to hurt Lex, in case the missing stone from China is not delivered to her. But Lionel soon turns the tables on Genevieve by poisoning her (the same way he unsuccessfully tried to poison Lex in the previous season) and threatens not to give her the antidote unless she gives him the second missing stone whom she in fact stole from the murdered Bridget Crosby.

On the last day of Smallville High before graduation, the emotionally disturbed and frustrated photographer of the Torch, Brendan Nash, feels rejected by the Universities and decides to abduct some schoolmates to stay with him forever in a replica of the school. He uses his power of 'Medusa Touch' of turning people into stone by mere touch, and brings Lana, Chloe, and other successful schoolmates to the place. While Clark teams up with the nosy Lois to find the other students, he also talks with Jonathan and Martha over his college choices after graduation. Meanwhile, Genevieve and Jason Teague kidnap Lionel and Lex Luthor and hold them hostage in a remote mountain cabin and torture both of them to try to retrieve the second mystical stone that Lionel took from them.

When Lana (possessed by Isobel) kills Genevieve Teague by stabbing her with one of the Kryptonian Knowledge Crystals after she attempts to steal it, it triggers a cosmic event that not only severs Lana's link to the spirit Isobel but also sends meteorites from deep space toward Earth and Smallville. At the graduation ceremony for Smallville High, the military arrives to evacuate the town after news that another meteor shower is imminent. Fearing he has a link to the meteorites, Clark goes to talk to the spirit of Jor-El, who informs him that his only hope is to unite the knowledge crystals in the cave. With time running out, Clark sets about locating the final two crystals as meteorites reign down upon Smallville. Lana gives Clark the third stone they recovered from China, which was in her possession all this time, while the second stone is on Lionel's person, which activates. Lex offers to protect Lana and have her flown to New York City, but she gets caught in the meteor shower while riding in a helicopter. Lois manages to get out of Smallville in time, but Chloe stays behind to follow Clark who retrieves the final one from Lionel which hits them with a burst of energy driving him comatose. Chloe helps Clark retrieve the final stone from the Luthor mansion safe after he is immobilized by kryptonite, and helps him escape from Lex. Clark manages to unite all three stones, which transports him to the wild tundra of the frigid North Pole...