Feature-length animated adventure following Scooby-Doo (voice of Frank Welker) and the gang as they team up with Batman (Diedrich Bader) to solve another mystery. After they are saved by Batman, Scooby, Shaggy (Matthew Lillard), Daphne (Grey Griffin), Velma (Kate Micucci) and Fred (Welker) find themselves joining forces with the caped crusader and some of his greatest allies when they discover some of their most fearsome enemies have teamed up to enact an evil plan in Gotham City. Can they save the day together?