Don Messick
Donald Earle Messick (September 7, 1926 – October 24, 1997) was an American voice actor, known for his performances in Hanna-Barbera cartoons.[1] His best-remembered voice roles 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. From Wikipedia.
Filmography
Tom & Jerry Kids Show
The Flintstones
The Transformers
The Smurfs
DuckTales
Tiny Toon Adventures
The Jetsons
Bobby's World
Super Friends
The Atom Ant Show
Scooby-Doo, Where Are You!
Gumby
Scooby-Doo and Scrappy-Doo
Freakazoid!
Dastardly and Muttley in Their Flying Machines
Top Cat
Scooby's Laff-A Lympics
Droopy, Master Detective
Heathcliff
The Yogi Bear Show
The Ruff and Reddy Show
The Huckleberry Hound Show
Cattanooga Cats
The New Scooby-Doo Movies
Birdman and the Galaxy Trio
The Flintstone Comedy Show
Wacky Races
Space Ghost and Dino Boy
The Magilla Gorilla Show
Sabrina, the Teenage Witch