Was most famous as the voice of several Hanna-Barbera characters, including Scooby-Doo and Scrappy-Doo, Boo-Boo Bear, Muttley from Wacky Races and Dastardly and Muttley in their Flying Machines, Bamm-Bamm Rubble in The Flintstones, The Jetsons? dog Astro,