Mumbley and the Dread Baron were added to the Really Rottens to replace Muttley and Dick Dastardly, who were not owned by Hannah-Barbara. Dastardly and Muttley were owned by Heatter-Quigley productions. Fondu may have been a replacement as well.
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We asked Doctors Jo Wilson, April Kepner, and Andrew DeLuca to tell us the episodes of the show that they think are the most essential to understanding their characters.