Scott's friends pledge to protect him against an increasingly hostile enemy while Argent, Isaac and Allison search for answers through an old adversary from the Japanese Yakuza. At the same time, Stiles enlists Melissa's help in figuring out exactly what's going on with him.

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

An assassin targets Scott and Liam at the lacrosse team's annual bonfire.

Kira and her mother make a journey to help Kira deal with her dark side; Lydia is surprised at Eichen House.