Scott and Stiles take Allison and Lydia on an ice skating date. Derek converts Erica. Mrs. Argent begins to suspect that Allison is still seeing Scott despite her promise not to.

When Derek decides that Lydia must be the lizard shifter and that she must die, the gang must all pitch in to see that she's safe.

When it becomes apparent that Jackson is the Kanima, Scott chases him and rescues Allison's dad but is seen by her grand-dad. Scott and Stiles finally catch up with Jackson/the Kanima where he's stalking Danny in a gay club.