Mecha Mutt, a revolutionary remote-controlled lunar rover resembling a large canine, goes rogue at Houston's Annual Science Expo. Scooby-Doo! Mecha Mutt Menace is the fourth in a series of direct-to-video short films. Frank Welker, Matthew Lillard, Grey DeLisle, Mindy Cohn, Julie Bowen, Lacey Chabert, Alan Rachins Added on HBO 2022-11-03.