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Season 1 Episode 6: Dexter is called to the scene of the crime at the Castillo junkyard. The Ice Truck Killer has returned Valerie Castillo's body putting Dexter in danger of being caught. A boy is found who witnessed the crime.
Season 2 Episode 6: Dexter is none too pleased to discover a copy-cat killer has started his own attempt at vigilante serial murder in Miami. He is even less pleased to learn the new killer claims to be inspired by the "Bay Harbor Butcher." As Dexter sets out to stop the imposter, he finds himself drawn into the arms of Lila. When Rita discovers the truth, it could be the end of their relationship.
Season 3 Episode 6: Miguel is put to the test by Dexter. Rita is forced to reconsider her choices. Debra begins to feel like she had some part to play in a homicide case she's working on.
Season 4 Episode 6: Dexter knows it's only a matter of time before the Trinity Killer's latest handiwork is discovered by Miami Metro. He has to work doubly hard to stay one step ahead of their investigation. Debra is shut out from her own case. She considers risking her career and bending the rules in the name of justice. LaGuerta and Batista realize that by playing by the rules they may have painted themselves into a corner. Dexter gleans relationship advice from a most unlikely source when the friction between Rita and Dexter comes to a head.
Season 5 Episode 6: Striving to bring some normalcy back into his shattered life, Dexter figures the answer lies in finding a new serial killer to bring down, but his quest gets thrown off course when his troubled new acquaintance requires his help. Meanwhile, Batista uncovers a revealing new lead in the Santa Muerta homicides, and Quinn gets a tip about Dexter, but is not sure he can trust his source.