Werewolf is a limited-time premium character that was released on October 17, 2018, during Act 2 of the Treehouse of Horror XXIX Event. He is unlocked upon the placement of the Howl Hill.
He was re-released on October 30, 2019, as part of Act 2 of the Treehouse of Horror XXX Event. Together with the Howl Hill, they were the fourth prizes to be won in the event's Act 2.
Werewolf is a monster, who bought new costume for Halloween - costume of Harry Potter. His wife, She-Wolf, turned up at the party and attacked him for flirting with other women.