Scooby-Doo and the gang visit the set of a revival of Scooby and Shaggy's favorite movie franchise, only to discover that the future of a whole movie universe depends on Mystery Inc.! Scooby's able to lend a paw when robot stunt dog "Andy Circuits" is injured, but how will our heroes figure out who's under the helmet of the Black Knight trying to bring production to a permanent halt?