Springtrap, previously known as Spring Bonnie, is the main antagonist of Five Nights at Freddy's 3 and the withered form of Spring Bonnie. He is possessed by William Afton, the primary antagonist of the series. Springtrap appears as a weathered springlock suit inhabited by the undead William Afton, who initially donned the costume to murder his victims and to hide from his victim's spirits later on. He is permanently fused to the mechanical frame and now haunts as a relentless killer.