Elena and The Pack storm the Delphi building to save Savannah, the witches, and the werewolves in a final showdown against Aleister and Clara.

With Aleister's Undoing spell underway, Elena, Clay, Paige and Nick try to find him only to discover Aleister's sinister endgame for Savannah once the Undoing is complete. Meanwhile, Jeremy helps Ruth delve into Left Hand magic in order to take down Aleister from afar, and Logan spirals into his own dark corner after Rachel delivers some devastating news.

Having possessed Clay's body, Aleister returns to Stonehaven where he creates ideal conditions to abduct Savannah. Meanwhile, Clay finds himself trapped in his unconscious, wrestling with both the occupying Aleister and his own mind in a way that could destroy him.

The Pack has things under control when the Council of Alphas reassembles at Stonehaven until a surprise visit from Savannah upends their plans. Meanwhile, Nick and Paige inadvertently bring danger to a loved one's doorstep.

Aleister casts a mind-bending spell on Elena, forcing her to battle her dark fears and demons.

In order to stay alive, Elena must guide Dr. Bauer through her first Change as The Pack and Coven try to figure out who Aleister is, and where his compound is located.

Elena awakens to find herself the subject of painful tests in a hidden compound run by a maniacal and powerful cult leader. Meanwhile, The Pack and witches must resort to dark magic in an effort to track down their missing members.

A new threat proves to be more powerful than anticipated; the pack and coven suffer heavy losses.

Clay investigates a mysterious symbol that may be related to witchcraft.

Elena and The Pack are on the hunt for Malcolm. Meanwhile, back at Stonehaven, Jeremy receives an ultimatum from the Council of International Alphas that challenges his leadership over North America.