The Scooby-Doo/Dynomutt Hour - Season 1 Episode 20
Watch TV Shows The Scooby-Doo/Dynomutt Hour HD The super pair meets Swamp Rat and Mudmouth, two evil swamp monsters determined to turn Big City into a swamp.
- Year: 1976
- Country: United States of America
- Genre: Animation, Comedy, Family, Kids, Mystery
- Studio: ABC
- Director: William Hanna, Joseph Barbera
- Cast: Henry Corden, Allan Melvin, Casey Kasem, Julie McWhirter, Micky Dolenz, Don Messick