Malcolm McDowell has made time travel possible, so he takes the gang along into the past, but an accident causes them to go into a nightmare future.

Our mystery-solving gang is in Chicago investigating the haunting of a historic hot dog factory, when they team up with famous competitive eater Joey Chestnut who's in town for the annual hot dog eating competition.

When Shaggy and Scooby meet up with their good friend Liza Koshy at an old haunted mansion, they find themselves the subject of her many fast-paced internet videos and at the center of a horrifying ghost attack.