Filmography
- The Transformers: The Movie (1986) (Unicron roar) When in a flashback scene, the viewer will hear The Incredible Hulk roar from the 1982 animated series, when the Matrix is passed on to Ultra Magnus from Optimus Prime.
- The Adventures of the American Rabbit (1986) (voice) .... Rodney
- The 13 Ghosts of Scooby-Doo (1985) TV Series (voice) .... The Concierge
- Disney's Adventures of the Gummi Bears (1985) TV Series (voice)
- Explorers (1985) (voice) .... Special vocal effects
- The Snorks (1984) TV Series (voice) .... Mr. Seaworthy
- Challenge of the GoBots (1984) TV Series (voice) .... Cop-Tur
- Gremlins (1984) (voice) .... Mogwai and Gremlins
- The Biskitts (1983) TV Series (voice) .... Spinner/Bump/Flip
- Dungeons & Dragons (1983) TV Series (voice) .... Shadow Demon
- Rubik, the Amazing Cube (1983) TV Series .... Additional Voices
- The Smurfs (1981) TV Series (voice) .... The King (1982–1990)
- The Incredible Hulk (1982) TV Series (voice) .... The Hulk, Juggernaut, Puppet Master
- Flash Gordon: The Greatest Adventure of All (1982) (TV) (voice) .... Zarkov
- The Grinch Grinches the Cat in the Hat (1982) (TV) (voice) .... The Grinch
- The Kwicky Koala Show (1981) TV Series (voice)
- Dennis the Menace in Mayday for Mother (1981) (TV) (voice) .... Henry Mitchell
- Strawberry Shortcake in Big Apple City (1981) (TV) (voice) .... Coco Nutwork
- The New Animated Adventures of Flash Gordon (1979) TV Series .... Additional Voices
- The Fabulous Funnies (1978) TV Series (voice) .... Alley Oop/Foozy/King Guzzle
- Challenge of the SuperFriends (1978) TV Series (voice)
- The Puppy Who Wanted a Boy (1978) (TV) (voice)
- Dynomutt, Dog Wonder (1978) TV Series (voice) .... Additional voices
- The Mouse and His Child (1977) (voice) .... Muskrat
- The Great Grape Ape Show (1977) TV Series (voice) .... Great Grape Ape
- The Skatebirds (1977) TV Series (voice) .... Satchel Pelican
- The Oddball Couple (1977) TV Series (voice) .... Additional voices
- The Kentucky Fried Movie (1977) (voice) .... Voice overs
- Wizards (1977) (voice) .... Avatar
- Scooby's All-Star Laff-a-Lympics (1977) TV Series (voice) .... Dinky Dalton, Grape Ape, Orville Octopus
- Tony Orlando and Dawn (1974) TV Series .... Regular (1976)
- The Pink Panther and Friends (1976) TV Series (voice) .... Hoot Kloot/Fester/Harry Halibut
- Medicur (1976) (voice)
- The Scooby-Doo/Dynomutt Hour (1976) TV Series (voice)
- Rockhounds (1975) (voice)
- The New Tom & Jerry Show (1975) TV Series (voice) .... Grape Ape
- Goldilox & the Three Hoods (1975) (voice) .... Dogfather
- The Day of the Locust (1975) .... Tour Guide
- Eagle Beagles (1975) (voice) .... Dogfather
- From Nags to Riches (1975) (voice)
- Haunting Dog (1975) (voice) .... Dogfather
- M-o-n-e-y Spells Love (1975) (voice)
- Rock-a-Bye Maybe (1975) (voice) .... Dogfather
- Watch the Birdie (1975) (voice) .... Dogfather/Pug
- Saltwater Tuffy (1975) (voice) .... Dogfather/Pugg
- The Hoober-Bloob Highway (1975) (TV) (voice) .... Mr. Hoober-Bloob
- Abby (1974) (voice) .... The Demon
- Bows and Errors (1974) (voice) .... Dogfather
- Deviled Yeggs (1974) (voice)
- Mother Dogfather (1974) (voice) .... Dogfather/Pug
- The Big House Ain't a Home (1974) (voice) .... Dogfather
- Heist and Seek (1974) (voice)
- The Goose That Laid a Golden Egg (1974) (voice) .... Dogfather
- Hong Kong Phooey (1974) TV Series (voice)
- The Dogfather (1974) (voice) .... Dogfather
- The Nine Lives of Fritz the Cat (1974) (voice) .... Many voices
- Mesa Trouble (1974) (voice) .... Hoot Kloot
- Saddle Soap Opera (1974) (voice) .... Hoot Kloot
- By Hoot or by Crook (1974) (voice) .... Hoot Kloot
- Strange on the Range (1974) (voice)
- The Badge and the Beautiful (1974) (voice) .... Hoot Kloot
- Big Beef at the O.K. Corral (1974) (voice) .... Hoot Kloot
- As the Tumbleweed Turns (1974) (voice) .... Hoot Kloot
- Giddy Up Woe (1974) (voice) .... Hoot Kloot
- Gold Struck (1974) (voice) .... Hoot Kloot
- Phony Express (1974) (voice) .... Hoot Kloot
- The Bear Who Slept Through Christmas (1973) (TV) (voice) (as Robert Holt) .... Santa Claus
- Ten Miles to the Gallop (1973) (voice) .... Hoot Kloot
- Stirrups and Hiccups (1973) (voice) .... Hoot Kloot
- A Self-Winding Sidewinder (1973) (voice) .... Hoot Kloot
- Pay Your Buffalo Bill (1973) (voice) .... Hoot Kloot
- The Addams Family (1973) TV Series (voice)
- Bailey's Comets (1973) TV Series (voice) .... Dude
- "Green Eggs and Ham" (1973) CBS TV short (voice)
- The Shoe Must Go On (1973) (voice) .... Hoot Kloot/Fester
- Apache on the County Seat (1973) (voice) .... Hoot Kloot
- Charlotte's Web (1973) (voice) .... Homer Zuckerman
- Wham and Eggs (1973) (voice) .... Dragon
- Dr. Seuss on the Loose (1973) (TV) (voice) .... Sylvester McMonkey McBean/Sneetches
- Kloot's Kounty (1973) (voice) .... Hoot Kloot
- New Zoo Revue" (1972) (voice) .... Charlie Owl
- The Barkleys (1972) TV Series (voice)
- The Houndcats (1972) TV Series (voice) .... Various
- Support Your Local Serpent (1972) (voice) .... The Blue Racer/Japanese Beetle
- Flight to the Finish (1972) (voice) .... Crazylegs Crane
- The Lorax (1972) (TV) (voice) .... The Lorax, The Once-ler
- Love, American Style (1972) TV Episode (voice) .... (segment "Love and the Private Eye")
- Pink-In (1971) (voice) (uncredited) .... Loud-Mouth Louie
- Bedknobs and Broomsticks (1971) (voice) (as Robert Holt) .... Mr. Codfish
- Doctor Dolittle (1970) TV Series (voice) (as Robert Holt) .... Dr. John Dolittle
- Johnny Learns His Manners (1968) (voice) .... All the Voices
- The Great St. Louis Bank Robbery (1959) .... Police Dispatcher
- Julius Caesar (1950) .... Octavius Caesar
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