A dangerous enemy forces Scott to help him. Derek and Malia track down an old ally.

Scott, Stiles and Kira participate in their first Lacrosse game; Lydia looks to get help controlling her powers.

When the full moon is out, Lydia’s lake house brings uninvited guests, and Derek hunts for a killer.

Whilst Stilinski investigates a murder, Scott has his place on the Lacrosse team threatened by a freshman.