Kenneth Mars
- The Little Mermaid Live!
2019 King Triton (archive footage) (voice)
- The Land Before Time
2007 Grandpa Longneck (voice)
- The Land Before Time: 2 DinoRiffic Adventures
2006 Grandpa Longneck
- The Land Before Time XII: The Great Day of the Flyers
2006 Grandpa / Parasaurlophus (voice)
- Hannah Montana
2006 Gunther
- The Land Before Time XI: Invasion of the Tinysauruses
2005 Grandpa (voice)
- Disney Heroes Volume 1
2005 Old Gorilla (voice)
- The Land Before Time X: The Great Longneck Migration
2003 Grandpa (voice)
- Oliver Beene
2003 Carl the Super
- The Land Before Time IX: Journey to Big Water
2002 Grandpa (voice)
- Good Morning, Miami
2002 Marty
- The Land Before Time VIII: The Big Freeze
2001 Grandpa / Lambeosaurus (voice)
- Teddy Bears' Picnic
2001 Gene Molinari
- The Legend of Tarzan
2001 Old Gorilla (voice)
- The Land Before Time VII: The Stone of Cold Fire
2000 Grandpa (voice)
- The Little Mermaid II: Return to the Sea
2000 King Triton (voice)
- Runaway Virus
2000 Dr. Arnold Bowman
- Malcolm in the Middle
2000 Otto Mannkusser
- The Land Before Time VI: The Secret of Saurus Rock
1998 Grandpa (voice)
- L.A. Doctors
1998 Bill
- Becker
1998 Melvin
- Will & Grace
1998 Uncle Sid
- Bruno the Kid: The Animated Movie
1997 Professor Von Trapp (voice) (archive footage)
- The Land Before Time V: The Mysterious Island
1997 Grandpa (voice)
- Just Shoot Me!
1997 Horst
- Cow and Chicken
1997 Candy Store Geek / Policeman (voice)
- You Wish
1997 Santa Clause
- Citizen Ruth
1996 Dr. Charlie Rollins
- The Land Before Time IV: Journey Through the Mists
1996 Grandpa (voice)
- Making Frankensense of Young Frankenstein
1996 Inspector Kemp (archive footage)
- The Pretender
1996 Benny
- Nash Bridges
1996 Ronald Bishop
- Boston Common
1996 Clown
- Bruno the Kid
1996
- Arli$$
1996 Coach Duffy
- Rough Magic
1995 Magician
- The Land Before Time III: The Time of the Great Giving
1995 Grandpa (voice)
- The Drew Carey Show
1995 Mr. Tinsley
- Freakazoid!
1995 Dr. Gunther Hunterhanker (voice)
- The Naked Truth
1995 Judge
- The Land Before Time II: The Great Valley Adventure
1994 Grandpa (voice)
- Thumbelina
1994 King Colbert (voice)
- Duckman
1994 Native American (voice)
- Weird Science
1994
- Party of Five
1994 Earl Garraty
- We're Back! A Dinosaur's Story
1993 Professor Screweyes (voice)
- Sex, Shock & Censorship in the 90's
1993 Reverend Pete
- Mighty Max
1993
- Diagnosis: Murder
1993 Wallace Carstairs
- Lois & Clark: The New Adventures of Superman
1993 Grant Gendell
- Animaniacs
1993 Beethoven (voice)
- Star Trek: Deep Space Nine
1993 Colyus
- Fievel's American Tails
1992 Sweet William (voice)
- The Little Mermaid
1992 King Triton (voice)
- Batman: The Animated Series
1992 Richard (voice)
- Hangin' with Mr. Cooper
1992 Mr. Hucklebuck
- Shadows and Fog
1991 Magician
- Mimi & Me
1991 Uncle Al
- Darkwing Duck
1991
- The Pirates of Dark Water
1991 Additional Voices
- Rugrats
1991 Toothbrush / Candy Bar (voice)
- She'll Take Romance
1990 Smokey
- Bobby's World
1990
- TaleSpin
1990 Heimlich Menudo (voice)
- Tom & Jerry Kids Show
1990 Narrator (voice)
- Evening Shade
1990 Mayor Ogden
- The Little Mermaid
1989 Triton (voice)
- Get Smart, Again!
1989 Cmdr. Drury
- Police Academy 6: City Under Siege
1989 Mayor
- For Keeps
1988 Mr. Bobrucz
- Illegally Yours
1988 Hal B. Keeler
- Top Cat and the Beverly Hills Cats
1988 Director / Dogcatcher (voice)
- Rented Lips
1988 Reverend Farrell
- The Adventures of Raggedy Ann and Andy
1988 The Camel with the Wrinkled Knees
- A Pup Named Scooby-Doo
1988 Additional Voices (voice)
- Radio Days
1987 Rabbi Baumel
- A Different World
1987 Ridley
- DuckTales
1987 Auric (voice)
- The Adventures of the American Rabbit
1986 Vultor / Walt (voice)
- L.A. Law
1986 Judge John Zimring
- The Flintstone Kids
1986 Narrator
- Perfect Strangers
1986 Ace Atkins
- Fletch
1985 Stanton Boyd
- Beer
1985 A.J. Norbecker
- Prince Jack
1985 Lyndon Johnson
- Misfits of Science
1985 Sen. Donner
- The Twilight Zone
1985 (segment "Tooth and Consequences")
- 227
1985
- Misfits of Science
1985 Sen. Donner
- The 13 Ghosts of Scooby-Doo
1985 Mayor (voice)
- Protocol
1984 Lou
- Charles in Charge
1984 Poppa Grundov
- The Duck Factory
1984 Harmon Alison
- Murder, She Wrote
1984 Hemsley Post
- Yellowbeard
1983 Mr. Crisp
- The Biskitts
1983 Fetch
- Saturday Supercade
1983 Quickclaw (voice)
- Masquerade
1983 Harold Hayes
- Pitfall
1983 Quickclaw
- The Rules of Marriage
1982 Red Hewitt
- Remington Steele
1982 Douglas Veenhof
- Cagney & Lacey
1982
- Tucker's Witch
1982
- The Rules of Marriage
1982 Red
- Full Moon High
1981 The Coach - Principal Cleveland
- Simon & Simon
1981
- Laverne & Shirley in the Army
1981 Sgt. Turnbuckle
- Magnum, P.I.
1980 Joseph
- The Flintstone Comedy Show
1980 Lou Granite
- The Apple Dumpling Gang Rides Again
1979 Woolly Bill Hitchcock
- You Can't Take it With You
1979 Mr. Kolenkhov
- Before and After
1979 Ben Fryer
- Heaven Only Knows
1979 Bert Hammond
- Hart to Hart
1979 Dr. Cobb
- Scooby-Doo and Scrappy-Doo
1979 Director
- $weepstake$
1979
- Supertrain
1979 Turley
- Goin' Coconuts
1978 Kruse
- Project U.F.O.
1978
- Alice
1976
- Good Heavens
1976
- Night Moves
1975 Nick
- Someone I Touched
1975 Paul Wrightwood
- It's a Bird, It's a Plane, It's Superman!
1975 Max Mencken
- Barney Miller
1975 Officer Callahan
- Wonder Woman
1975 Colonel Von Blasko
- Young Frankenstein
1974 Inspector Kemp
- The Parallax View
1974 Former FBI Agent Will
- Hello Mother, Goodbye!
1974 Son
- Police Woman
1974
- Hello Mother, Goodbye!
1974 Son
- Harry O
1974 Don Yorkfield
- Steambath
1973 Broker
- Guess Who's Sleeping in My Bed?
1973 Mitchell Bernard
- Hawkins
1973 Lester De Ville
- Barnaby Jones
1973 William Tarkington IV
- Here We Go Again
1973 Jim Sutton
- What's Up, Doc?
1972 Hugh Simon
- Second Chance
1972 Dr. Julius Roth
- Desperate Characters
1971 Otto Bentwood
- Columbo
1971 Mike
- McMillan & Wife
1971 Dr. Thursby
- Butch Cassidy and the Sundance Kid
1969 Marshal
- Viva Max!
1969 Dr. Sam Gillison
- The April Fools
1969 Les Hopkins
- Room 222
1969
- Love, American Style
1969 Jake
- The Producers
1968 Franz Liebkind
- The Ghost & Mrs. Muir
1968 Joshua T. Albertson
- Mannix
1967
- He & She
1967 Harry Zarakardos
- Ironside
1967 Adam Bronson
- That Girl
1966
- ABC Stage 67
1966 Dr. Pratt
- Get Smart
1965 Tom Orlando
- Act One
1963 Robert E. Sherwood
- Gunsmoke
1955 Clyde Hayes
