The Scooby-Doo/Dynomutt Hour is a 60-minute package show produced by Hanna-Barbera Productions in 1976 for ABC Saturday mornings. It marked the first new installments of the cowardly canine since 1973, and contained the following segments: The Scooby-Doo Show and Dynomutt, … Henry Corden, Allan Melvin, Casey Kasem, Julie McWhirter, Micky Dolenz, Don Messick, Gary Owens Added on HBO 2023-02-05. Youtube Trailer