The mystery begins when Shaggy and Scooby win tickets to "WrestleMania" and convince the crew to go with them to WWE City. But this city harbors a spooky secret - a ghastly Ghost Bear holds the town in his terrifying … Frank Welker, Matthew Lillard, Grey DeLisle, Mindy Cohn, AJ Lee, Mary McCormack, John Cena Added on HBO 2022-06-06. Youtube Trailer