Billy the Dog is one of the antagonists in Nightmare at Charles. He is the organist and one of the animatronics housed in Charles' Pizza Zone, positioned at the right. During the day he interacts and plays songs for the children who visit the restaurant, but at night all of that changes when he is left to roam freely around until 6 AM. Like the others, since he has a glitchy night mode, he will try to force any human he sees after hours into an animatronic, which will kill them instantly due to the suits themselves containing animatronic devices.