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Donald Earl "Don" Messick (September 7, 1926 - October 24, 1997) was an American voice actor who was best known for his voice work for Hanna-Barbera. His best-remembered voice roles include Boo Boo Bear and Ranger Smith from The Yogi Bear Show, Bamm-Bamm Rubble from The Flintstones, Astro from The Jetsons, Scooby-Doo from Scooby-Doo (as well as his nephew Scrappy in later seasons), and Papa Smurf from The Smurfs.