: While Gerard Argent and others believe the only way to stop the threat is to kill the host, Scott McCall and Liam Dunbar focus on finding a way to extract Mason from the Beast before he is completely erased by Sebastien's consciousness. Episode Cast & Crew Director : Tim Andrew Main Cast : Tyler Posey as Scott McCall Dylan O'Brien as Stiles Stilinski Holland Roden as Lydia Martin Dylan Sprayberry as Liam Dunbar Khylin Rhambo as Mason Hewitt
: Desperate for power, Theo Raeken attempts to steal the Beast's strength. Guided by Deucalion, he kills his own pack member, Josh, to absorb his power, only to realize he is still outmatched by the ancient werewolf. [S5E19] The Beast Of Beacon Hills
In of Teen Wolf , titled "The Beast of Beacon Hills," the pack faces a race against time as the identity of the Beast is finally confirmed to be Mason Hewitt . Mason is revealed as the successful genetic chimera and vessel for the 18th-century killer, Sebastien Valet . Key Plot Developments : While Gerard Argent and others believe the
This episode serves as the penultimate chapter of Season 5, setting the stage for the final confrontation in "Apotheosis". In of Teen Wolf , titled "The Beast
: The Beast, now fully manifesting, turns on its creators. Sebastien Valet kills the Dread Doctors without hesitation, viewing them as no longer useful once he has returned to the physical world.