- 1 Bizarro
During Clark's battle with the last Phantom Zone wraith, Lex is rescued by a mysterious woman. She then goes to the Kent farm and reveals she is Clark's cousin, Kara, from Krypton.
Air Date: 2007-09-27
- 2 Kara
Clark and Lois meet Smallville's newest arrival face-to-face, and she has some surprising news. Clark decides to leave Smallville and continue with his superhero training but Jor-el informs him that a new Kryptonian menace has arisen.
Air Date: 2007-10-04
- 3 Fierce
Kara takes to life in Smallville by getting a job at the Talon, and entering the Miss Sweet Corn Pageant as a contestant, overruling Clark's objections. However, Lex takes an interest in her and three of the other contestants discover she has super-powers and decide to use her to steal a valuable time capsule.
Air Date: 2007-10-11
- 4 Cure
Dr. Curtis Knox says he can "cure" someone from being a "meteor freak," changing their lives. Chloe takes an interest in this, but Dr. Knox may have another secret. [Dr. Knox seems to be Randel Savage, an 25.000 years old immortal. There are several references to his past and there is the antique watch, a symbol of Randel Savage]
Air Date: 2007-10-18
- 5 Action
When a movie is shot in Smallville, Clark is forced to secretly use his powers to save someone from a runaway car... but somebody is looking and becomes Clark's biggest fan. Meanwhile, Lionel's fate is revealed.
Air Date: 2007-10-25
- 6 Lara
Kara goes to Washington to look for her missing crystal, but is captured after she breaks into the lab. She's sedated with a truth serum that has kryptonite in it, which makes her relive a trip to Earth from the past. In this past trip she followed Lara, Clark's biological mother, to the Kent's farm. Clark saves Kara, but also ends up being affected by the serum when he burns it with his heat vision.
Air Date: 2007-11-01
- 7 Wrath
Lana absorbs Clark's powers during a lightning storm, which she uses to break into Lex's safe and steal some incriminating evidence. After being turned away by Grant at the Daily Planet, who won't accept her stolen evidence, Lana goes after Lex herself. Clark tries to rescue Lex, but must first battle the super-powered Lana.
Air Date: 2007-11-08
- 8 Blue
Clark hears his mother's voice trapped in Kara's crystal, and releases her. She gives him Jor-El's ring made of Blue Kryptonite, which strips him of his powers.
Air Date: 2007-11-15
- 9 Gemini
A mysterious man who claims to be a product of Lex's latest project plants a bomb on Chloe and uses her to force Lois to get the truth from Lex.
Air Date: 2007-12-13
- 10 Persona
Chloe begins to notice that Clark's not acting like himself. Bizarro enlists the help of Brainiac.
Air Date: 2008-01-31
- 11 Siren
When Green Arrow's band of heroes thwarts his efforts once too often, Lex employs a super-powered vigilante to take down the Emerald Archer.
Air Date: 2008-02-07
- 12 Fracture
Lex tracks the amnesiac Kara to Detroit, where Lois follows him. An obsessive busboy infatuated with Kara shoots Lex, and Chloe has to determine whether to heal him or not.
Air Date: 2008-02-14
- 13 Hero
Pete Ross returns to town and finds a number of surprising changes since his departure. Besides resolving his feelings toward Clark since he learned of his friend's secret, Pete has to deal with the acquisition of a superpower of his own.
Air Date: 2008-03-13
- 14 Traveler
Lionel has Clark kidnapped, and when Chloe and Lana confront him, he makes them think Lex is the culprit. Chloe and Lana then beg Jor-El to restore Kara's memory because she's the only person who can rescue Clark.
Average Episode Rating: 3.0 | Air Date: 2008-03-20
- 15 Veritas
Clark must learn a new superpower as he and Kara join forces to take on Brainiac, putting the lives of their friends in danger.
Average Episode Rating: 3.0 | Air Date: 2008-03-27
- 16 Descent
No one is safe when Lex seeks the secret of Veritas, and Clark tries to stop him.
Average Episode Rating: 4.0 | Air Date: 2008-04-17
- 17 Sleeper
While Clark seeks out Brainiac to force him to fulfill his side of their bargain and restore Lana, Chloe and Jimmy go up against the government.
Average Episode Rating: 3.0 | Air Date: 2008-04-24
- 18 Apocalypse
When Clark wonders if the world would be better off if he never came to Smallville, Jor-El shows him what life would have been like if he had never existed.
Average Episode Rating: 4.0 | Air Date: 2008-05-01
- 19 Quest
After Lex is attacked by a mysterious stranger, he and Clark both discover the last surviving member of the Veritas group who holds the secret to controlling the Traveler.
Average Episode Rating: 4.0 | Air Date: 2008-05-08
- 20 Arctic
Lex is taken to the Fortress to fulfill his destiny, while Lana awakens from her coma and Chloe is arrested by the government.
Average Episode Rating: 4.0 | Air Date: 2008-05-15