After the fire that occured at Freddy Fazbear Pizza which was deguise as a trap designed by Henry to put an end in all this, the only remaining survival was William Afton, thanks to the vengeful spirit keeping him alive, in hopes of torturing him in real world and the astral world, she was blinded by RAGE! for only it to backfire on Cassidy and now William is back! and is stronger than ever! He goes back to an nearby abandoned Pizzeria, to salvage his old Yellow Rabbit mask so he can remove his already damage fredbear mask which Cassidy is attached to this fredbear mask, the very thing that Willam stuffed her body into many decades ago but he will now rebuild Cassidy from the ground up from scrap and metal, Willam can now use her as a secondary killing machine but the only thing that is getting in Willam's way now is Leo Smith an Police officer determined to take him down alongside with Henry.