Dread Baron

Dread Baron is an evil Dick Dastardly lookalike who appears in Laff-a-Lympics. He and Mumbly led the Really Rottens team. Voiced by John Stephenson, Dread Baron was created because Hanna-Barbera staff weren't sure they could actually use Dick Dastardly and Muttley again. It later turned out they could have, but by that point the show was in full production.