Official WB Description Dean and Sam come to the aid of Sam's old college buddy after he is accused of a murder he swears he didn't commit. The brothers discover a shapeshifter is adopting the likenesses of others and murdering people. The brothers' race to stop the shapeshifter takes a terrifying turn when he shifts into the likeness of Dean.
March 5, 2006 | Sam receives email about Zach from Rebecca; Dean and Sam head for St. Louis |
March 6, 2006 | Dean and Sam interview Becky; investigate Zach's house, watch security tapes; Shapeshifter attacks Lindsey |
March 7, 2006 | Dean and Sam go back to Zach's house and follow trail in the sewer; Lindsey's body is discovered; Dean and Sam follow new trail into the sewer; Shapeshifter attacks, becomes Dean; Sam and the shapeshifter meet at the Impala; Shapeshifter takes Sam prisoner |
March 7, 2006 (night) | Becky invites the shapeshifter in; Dean and Sam escape the sewer; shapeshifter attacks; SWAT arrives; shapeshifter flees; Sam distracts the police while Dean escapes; Dean goes back into the sewer and finds Becky; Sam goes to Becky's and the shapeshifter knocks him out; Sam and the shapeshifter fight; Dean arrives and kills the shapeshifter |
March 8, 2006 | Zach is released; Dean and Sam leave town |
Sam receives an email from a friend in Stanford, Rebecca Warren, whose brother Zach has been arrested for the murder of his girlfriend. Keen to help them out, Sam convinces Dean that they should travel to St. Louis.
When they arrive, Becky explains that Zach came home to find his girlfriend Emily beaten to death. Becky claims that Zach was with her when Emily was killed, but that a security tape shows him arriving home around the time of her death. Claiming that Dean is a police detective, Sam gets Becky to take them to the scene of the crime. The only clues they find are that the house was robbed about a week before the murder, and that the dog next door has become vicious since the attack. Dean is still skeptical, but when he and Sam examine the security tape, which Becky has obtained from Zach's lawyers, they see Zach's eyes flare when he looks directly at the camera.
Elsewhere in town, "Zach" watches a man leave his apartment and kiss his wife goodbye. Later that night, someone who appears to be the same man, returns and tortures her.
Early the next morning, Sam and Dean return to Zach's house, as Sam points out that if the person they saw enter was not Zach, then he must have left by the back entrance to avoid being captured on the video camera. The blood smear in the alley behind the house supports this theory. They then see an ambulance pass, and follow it to discover that another murder has occurred, and in a striking similarity to Zach's case, the man claimed to be driving home at the time his wife was killed.
Dean and Sam find another bloody trail behind the apartment block, and follow it down a manhole to the sewer. On finding a pile of skin and blood they realize they are dealing with a shapeshifter. Suddenly the shapeshifter attacks them, hurts Dean, and runs off. During their pursuit the boys are separated, and when they reunite at the car, having lost the creature, Sam suspects that Dean is actually the shapeshifter partly because he is not hurt. As Sam confronts him the creature knocks him out and takes him prisoner.
Sam regains consciousness in the sewer, bound to a beam. The shapeshifter has access to Dean's memories, and claims that Dean is angry at Sam for having left him to go to college, and for having opportunities Dean never had. The creature finally leaves, telling Sam it has plans to attack Becky.
At her house, Becky invites the shapeshifter, who she thinks is Dean, in for a beer. Meanwhile, in the sewer, Sam struggles to get free, and hears Dean regain consciousness. Together they manage to escape, calling in an anonymous tip to save Becky. At Becky's house, Becky and "Dean" talk for a while, but eventually the creature attacks her. Suddenly a SWAT Unit arrives, and the shapeshifter flees, leaving Becky alive but bloodied.
As the boys walk the streets, they see a police sketch of Dean on TV - he is now wanted in relation to Becky's attack. They return to find the Impala at Becky's house, but before they retrieve weapons the police show up. Dean escapes while Sam distracts the police, warning Dean not to go back to the sewer.
Dean, ignoring Sam's warning, returns alone to the sewer to track the creature, and finds Becky there - the creature has assumed her identity now. Back at Becky's house, the shapeshifter has tricked Sam, knocking him unconscious, and is holding him captive again. Sam cuts his ropes, and fights back. Just as Sam is being choked by Shapeshifter Dean, the real Dean arrives, finally shooting the creature who looks just like him.
The police decide to release Zach, as they now suspect "Dean Winchester," who they found dead at Becky's house, was the culprit in Emily's murder. As they leave town, Dean regrets that Sam can't be normal, and claims they are both freaks. He also muses that he is missing his own funeral.
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