A couple in the woods is met by a kanima.  It kills the man and leaves the woman, once it sees she is pregnant.  The woman, later in the hospital, is murdered by a hidden man.

Jackson acts even stranger than normal, eats a snake, and then attacks Allison while naked in the shower.  When Scott finds them, he fights Jackson, and they all end up in detention.

Jackson, or whoever is controlling him, tells his friends to stay out of his way or he will kill them all.

Lydia meets with a boy in his house, and starts kissing him.  The boy turns into Peter Hale, and the house turns into Peter's burnt down house.  Peter tells her that because of her immunity she is his "plan b."