You find a room in a abandoned museum with a doll in a cage, sitting. He is not moving at all and he has some cracks on the right side of his face

You see that it's a doll replica of Wally Darling from that old puppet show from the 70s called "Welcome Home"

You see the cage has chains on it and it has a note saying "WARNING! POSITIVELY DO NOT OPEN" the Wally Darling doll must be haunted