Aftermath

This episode takes place shortly after Erica's transformation.

Plot
Allison is fuelling up her car when the lights at the gas station go out. Someone throws a black bag over her head and kidnaps her. She ends up bound and gagged at Derek's house, sitting across from her father while a booming, omnipotent voice makes vague threats. Argent breaks from his binds and reveals that he set up this whole kidnapping as a way to get Allison started on her hunter training. As her first test, she must free herself from her binds. It takes her two and a half hours, which Argent's protege, waiting outside, informs her is a good time - it took him over three hours to free himself when he went into training. She leaves. As the other hunter heads to his motorcycle, a tentacle-y appendage trips him. He fights, but ultimately falls. In the moonlight, a steel blade gleam.

At school, Erica, has learned that her grandmother has died, leaving behind a massive inheritance for her, as well as a luxurious mansion in the woods. through an amazing transformation. The sexy girl shows up at the house to look at it, unaware that Piper Shaw is watching her. It doesn't take long for Seth to notice what Piper is doing. He grabs her and shows her to Erica. She angrily yells at Piper for having no respect and Piper is escorted home by the police for trespassing.

Scott and Stiles take Allison and Lydia on a "double-date" to the ice rink, after hours, their schoolmate, Boyd, works there and gave them the key. Lydia discovers purple flower petals scattered about the ice. She follows them and sees wolfsbane planted right in the ice. Crouching down, she sees a shadow beneath the surface... a man is under the ice, and his eyes open as he tries to break free. Lydia freaks out- but it is all in her mind.

After a confrontation in the hall with Erica, Seth starts to put the pieces together.

Jackson believes that Lydia is immune to the werewolf curse, and blames her for "immunizing him" against turning. Both Argent and Scott (separately) turn to the vet for information about werewolves, and it seems he has a lot to tell Scott (next week, of course). Alison's mom deliberately slices open her arm so that she has an excuse to go to the hospital and get stitched up by Scott's mom. Mrs. Argent is trying to find out if Scott and Allison are sneaking around, and when Mrs. McCall reveals that Scott didn't seem too heartbroken, Mrs. Argent decides they are indeed still seeing each other.