Scooby-Doo and the gang are on the case when a mysterious lake monster starts scaring the guests at a summer resort in Erie Point, where Fred, Daphne, Velma and Shaggy have taken on seasonal jobs to pay for a barn … Frank Welker, Kate Melton, Hayley Kiyoko, Nick Palatas, Robbie Amell, Marion Ross, Beverly Sanders Added on HBO 2023-06-27, leaving 2024-10-01. Youtube Trailer