
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.

The Transformers: The Movie
1986 · as Gears (voice)

Scoob!
2020 · as Muttley (archive sound) (voice)

Diamonds Are Forever
1971 · as Announcer at Circus Circus (uncredited)

Tom and Jerry: The Movie
1992 · as Droopy (voice)

The Last Unicorn
1982 · as The Cat (voice)

The Andromeda Strain
1971 · as Alarm (voice) (uncredited)

Charlotte's Web
1973 · as Jeffrey (voice)

Scooby-Doo and the Ghoul School
1988 · as Scooby-Doo / Scrappy-Doo (voice)

Scooby-Doo! and the Reluctant Werewolf
1988 · as Scooby-Doo / Scrappy-Doo (voice)

The Hobbit
1977 · as Balin/Troll #3/Goblin/Lord of the Eagles (voice)

The Jetsons Meet the Flintstones
1987 · as Astro / R.U.D.I / Mac / Announcer / Store Manager / Robot (voice)

The Return of the King
1980 · as King Theoden / Easterling / The Mouth of Sauron (voice)

Jetsons: The Movie
1990 · as Astro (voice)

Yogi Bear's Big Break
1958 · as Boo Boo Bear / Narrator / Guy In Car / Gopher (voice)

Tiny Toon Adventures: How I Spent My Vacation
1992 · as Hamton J. Pig / Radio Announcer (voice)

I Yabba-Dabba Do!
1993 · as (voice)

The Flight of Dragons
1982 · as Giles of the Treetops / Lo Tae Zhao (voice)

Scooby-Doo! Meets the Boo Brothers
1987 · as Scooby-Doo / Scrappy-Doo (voice)