Review - Series 4
| Episode 1 - Crusade |
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| Original Air Date: 22 September 2004 |
| Three months after the last episode, Lois Lane (Erica Durance), Chloe Sullivan's cousin, drives to Smallville trying to find Clark Kent to help her to... |
| Episode 2 - Gone |
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| Original Air Date: 29 September 2004 |
| The mystery surrounding Chloe's death deepens as Clark and Lois investigate, discovering that Lex Luthor and Lois' Dad, General Sam Lane are somehow i... |
| Episode 3 - Facade |
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| Original Air Date: 6 October 2004 |
| Without the approval of his father, Clark kicks off Senior Year by trying out for the Smallville High Football Team, who are now coached by Jason Teag... |
| Episode 4 - Devoted |
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| Original Air Date: 13 October 2004 |
| The Smallville High cheerleaders are using a kryptonite mixed love potion to seriously change the behavior of their victims. ... |
| Episode 5 - Run |
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| Original Air Date: 20 October 2004 |
| 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 tha... |
| Episode 6 - Transference |
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| Original Air Date: 27 October 2004 |
| Lionel Luthor, using one of the Kryptonian stones, attempts to swap bodies with Lex but inadvertently transfers bodies with Clark, leading to him lear... |
| Episode 7 - Jinx |
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| Original Air Date: 3 November 2004 |
| A mysterious bookie with powers of manipulation has a strange, even dangerous, effect on Clark and his friends. Meanwhile, Lex causes friction by usin... |
| Episode 8 - Spell |
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| Original Air Date: 10 November 2004 |
| As Clark and Lois arrange a surprise 18th birthday party for Chloe, Lana receives a mysterious book that belonged to her French ancestor Isabelle, who... |
| Episode 9 - Bound |
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| Original Air Date: 17 November 2004 |
| 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 i... |
| Episode 10 - Scare |
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| Original Air Date: 1 December 2004 |
| After an explosion at a LuthorCorp lab, Smallville's citizens "relive" their worst nightmares.... |
| Episode 11 - Unsafe |
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| Original Air Date: 26 January 2005 |
| 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... |
| Episode 12 - Pariah |
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| Original Air Date: 2 February 2005 |
| When Lana Lang is attacked in her apartment and Jason Teague in his car by an invisible being, the Smallville's dwellers believe that the attempts wer... |
| Episode 13 - Recruit |
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| Original Air Date: 9 February 2005 |
| Clark is wooed by the offer of a Football scholarship from Metropolis University but faces a dilemma over whether he should accept, knowing he has suc... |
| Episode 14 - Krypto |
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| Original Air Date: 16 February 2005 |
| Two trained and powerful dogs rob Smallville Cooperative under the command of the brothers Zack and Josh Greenfield, but one of them escapes and is hi... |
| Episode 15 - Sacred |
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| Original Air Date: 23 February 2005 |
| The metallic disc is returned to Clark following the death of Virgil Swann. Placing the disc in the cave reveals a message from Jor-El instructing Cla... |
| Episode 16 - Lucy |
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| Original Air Date: 2 March 2005 |
| Lois' sister, Lucy, arrives on the Kent Farm after she ran away from boarding school in Switzerland because she owed $50,000 to a loan shark. She enli... |
| Episode 17 - Onyx |
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| Original Air Date: 13 April 2005 |
| While performing an experiment with heated kryptonite at the Luthorcop's facility, the laboratory blows and the dark side of Lex Luthor is separated f... |
| Episode 18 - Spirit |
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| Original Air Date: 20 April 2005 |
| It's the day before the Prom and would be Prom Queen, Dawn Stiles, crashes her car in to a pile of meteor rocks. Her spirit separates from her body, b... |
| Episode 19 - Blank |
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| Original Air Date: 27 April 2005 |
| After the Talon is robbed, Clark Kent chases perpetrator Kevin Grady ('Jonathan Bennett' ). Grady erases Clark's memories in his attempt to escape. Ch... |
| Episode 20 - Ageless |
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| Original Air Date: 4 May 2005 |
| In the middle of the night on the road, a young woman is going to the maternity for the delivery, when she suddenly glows and blows. Lana Lang and Cla... |
| Episode 21 - Forever |
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| Original Air Date: 11 May 2005 |
| On the last day of the Smallville High, the frustrated photographer of the Torch, Brendan Nash (Steven Grayhm), feels rejected by the Universities and... |
| Episode 22 - Commencement |
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| Original Air Date: 18 May 2005 |
| When Lana kills Genevive Teague with one of the Kryptonian Knowledge Crystals it triggers a cosmic event that sends meteorites toward Earth and Smallv... |