Circus Baby is an animatronic made Bye Serial Killer William Afton. However When Williams Daughter Is Killed, Circus Baby is possessed with the spirt of Emily Afton And Has To Partake In All The Horror At Freddy's.

William Afton known as Purple Guy is a crazy killer who makes animatronics to capture children in pizzerias. William Afton has three children: Elizabeth, Michael and a stranger and Elizabeth is caught by Circus Baby an animatronic made to capture children.—João Pedro