Donald Earle Messick (September 7, 1926 – October 24, 1997) was an American voice actor. He was best known for his performances in Hanna-Barbera cartoons.His best-remembered vocal creations include Scooby-Doo, Bamm-Bamm Rubble and Hoppy in The Flintstones, Astro in The Jetsons, Muttley in Wacky Races and Dastardly and Muttley in Their Flying Machines, Boo-Boo Bear and Ranger Smith in The Yogi Bear Show, Sebastian the Cat in Josie and the Pussycats; Gears, Ratchet, and Scavenger in The Transformers, Papa Smurf and Azrael in The Smurfs, Hamton J. Pig in Tiny Toon Adventures, and Dr. Benton Quest in Jonny Quest.
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