Josh has been spending a lot of time with old wolf hippie Pete in the woods, trying to channel and control his own inner wolf (remember, Josh is a werewolf again - but hasn't yet changed).
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When Josh later comes to visit Pete, he finds vampires eating him, since wolf blood is the cure to the vampire plague. The vamps leave him alone, since Aidan ordered last episode that Josh & Nora be spared from anyone looking for wolf blood.
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Aidan, meanwhile, is having flashbacks to being human (heh, heh) back in the 1700's. Wife Susanna delivered a stillborn child, and the local reverend gave a sermon that indicated it was THEIR fault (unclean souls, bla bla). Aidan displays a remarkably progressive attitude for the 18th century and tells the Reverend he's a jerk.
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Aidan, despite his best efforts, was affected by the Reverend's speech. When his wife goes into labor, Aidan makes a deal with God to be a good man in exchange for his son's life. Sure enough, a baby boy is born.
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Aidan and Kat go on a date to the library (only people into the Revolutionary War or the Dewey Decimal system do this). There, they run into Kat's ex, Jeff. AWKWARD
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Later, after a revealing talk where Kat admits she wants kids - and Aidan tells her he can't have them - the two hook up something fierce.
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The next morning, Aidan wakes up outside again, seemingly with no memory of how he got there. Except...
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...Jeff, Kat's ex, is a few feet away. Dead, with teeth marks in his neck. What did Aidan do?
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Over in Sally's world, she gets a frantic call from Zoe. Zoe was forced to kill Nick after he attacked her. Nick's ghost forgives Zoe, and warns her to stay away from Sally - because her flesh lust will cause her to attack Zoe too.
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Showing true friendship, Sally buries Nick's body with Josh (who's showing even truer friendship. This is like the fifth time Josh has handled a corpse this season). Sally worries that Stevie's craving people, and brings Josh with her to find him.
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When they find Stevie, he's at his parents' house and claims everything is cool. But...
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...Josh finds the severed arm of the mailman. In the bread box of all places! Stevie admits he ate his own parents, too. Was the postal worker dessert or an appetizer, do you think?
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Lusting to eat Josh, Stevie begs them to kill him. Sally refuses, but Josh agrees to the mercy killing.
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Sally tells Josh she's scared. Scared of what she's becoming and that she'll try to attack him. Josh promises to help Sally find a solution.
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Stevie's ghost thanks Josh and Sally before going through his door. Sally notices it's the exact same door Nick went through - and knows something's wrong.