Known for Acting

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.
1971
as Announcer at Circus Circus (uncredited)
2020
as Muttley (archive sound) (voice)
1992
as Droopy (voice)
1986
as Gears (voice)
1982
as The Cat (voice)
1977
as Balin/Troll #3/Goblin/Lord of the Eagles (voice)
1971
as Alarm (voice) (uncredited)
1988
as Scooby-Doo / Scrappy-Doo (voice)
1988
as Scooby-Doo / Scrappy-Doo (voice)
1973
as Jeffrey (voice)
1994
as Scooby Doo / Boo-Boo Bear (voice)
1992
as Hamton J. Pig / Radio Announcer (voice)
1982
as Giles of the Treetops / Lo Tae Zhao (voice)
1980
as King Theoden / Easterling / The Mouth of Sauron (voice)
1990
as Astro (voice)
1964
as Boo-Boo / Ranger John Smith / Ranger Jones / Mugger the Dog (voice)
1987
as Scooby-Doo / Scrappy-Doo (voice)
1993
as (voice)
2002
as Scooby-Doo / Professor Flakey (voice) (archive footage)
1979
as Scooby-Doo (voice)