The Spooky Shadow is the Storybook Segemt from the episode: Haunted House Party!
Molly is a zombie, a very spooky monster. She becomes scared upon seeing a spooky shadow and she runs to the spooky motel, owned by Deema. Deema gives her a room and they both enter it after managing to pick the right key for it. Once inside they see the spooky shadow has followed them! But they soon learn that the spooky shadow was really a small white mouse that was out trick or treating.