TEXT: [PREVIOUSLY_ON] How many are there? Derek: A pack of 'em. An Alpha pack. Cora? She's my sister. My younger sister. Scott: I couldn't let that be the last memory that you had of her. You want to take this downstairs? Heather: You know what I want for my birthday? To not be a virgin. Stiles: Emily, Heather, the guy Lydia found at the pool, all three were virgins. Sacrifices. Human sacrifices. Kyle: It's not gonna hurt him, is it? Deaton: Just a little. But I usually find that it's the owners... [Winces] Who feel the most pain. All right. Well, we'll just check the stool sample for parasites, but my guess is that he probably just ate something he shouldn't have. Scott: Got a cool name. Kyle: He's got two brothers at home named Beretta and Trigger. Military family. [Dog whimpers] Kyle: Looks like he knows who the Alpha is. [Chuckles] Kyle: Let's go, buddy. [Dog whines] Kyle: Okay, this usually happens before we go to the vet. [Dog barking] Kyle: Hey! Scott: Found something. Deaton: Rinse it off. Scott: What is it? Deaton: Definitely poisonous... For the dog. Actually, for you as well. Scott: Wolfsbane? Deaton: Mistletoe. Kyle: Bullet? Come here, bullet. Come here, bullet. [Scraping] [Dog whimpering] Kyle: There you are. Come on, Bullet. [Sighs] Kyle: Aah, son of a bitch! Did you just bite me? [Dog whimpering] [Whispers] Closer... [Dog barks] Come closer... [Dog barking] [Roars] [Dog barking outside] [Suspenseful music] [SCENE_BREAK] [Dramatic music] [SCENE_BREAK] [Door shuts] [Suspenseful music] [SCENE
SUMMARY:
The body of the newest murder victim is found. The Alphas attack Derek, and Deucalion offers him a proposition: join the Alpha pack by killing his own Betas and absorbing their power. Stiles, Lydia and Deaton figure out that the serial killer is a Darach, a dark or evil druid . Mr. Harris is murdered next, though he seemed to know the killer. Derek, aware that Deucalion wants him to kill his pack, kicks Isaac out, so Isaac moves in with Scott.