The Mutant Peacock is a non-playable, limited-time character from the Treehouse of Horror XXV Event. It was unlocked as a personal prize on the Probe Prize Track for 3250 Probes - however, if players missed earning it as a prize, they could craft it using Craftables at the Make-a-Thing Workshop. It returned on May 21, 2015 during the Terwilligers 2015 Event for the price of 75 Donuts.