| — | Das 6 Millionen Dollar Girl | Dr. Rudy Wells |
| 2024 | Life After the NeverEnding Story | Self |
| 2022 | Chip 'n Dale: Rescue Rangers | He-Man / Skeletor (voice) |
| 2022 | We Baby Bears | Booey / Boater #1 (voice) |
| 2021 | Masters of the Universe: Revelation | Moss Man (voice) |
| 2019 | Toy Story 4 | Old Timer (voice) |
| 2019 | Forky Asks a Question: What Is Time? | Old Timer (voice) |
| 2017 | Power of Grayskull: The Definitive History of He-Man and the Masters of the Universe | Self - Voice Actor |
| 2016 | The Curse of the Three Terrors | Skeletor |
| 2015 | Fall of Grayskull | Narrator |
| 2014 | Foxcatcher | Du Pont Dynasty Narrator (voice) |
| 2010 | Adventure Time | Darren the Ancient Sleeper/Sun (voice) |
| 2009 | 9 | Scientist (voice) |
| 2009 | Superman/Batman: Public Enemies | Alfred Pennyworth (voice) |
| 2008 | Jane Doe: Eye of the Beholder | Hans Engelslepen |
| 2007 | The Making of God of War II | Prometheus |
| 2006 | 'Til Death | Mr. Wallach |
| 2003 | Clifford's Puppy Days | |
| 2001 | The Grim Adventures of Billy and Mandy | Father Time |
| 2000 | Gilmore Girls | Mr. Blodgett |
| 2000 | Navy Bear | |
| 1997 | The Practice | |
| 1997 | Culture | |
| 1995 | Star Trek: Voyager | Nezu Ambassador |
| 1995 | Caroline in the City | Mr. Booth |
| 1994 | Touched by an Angel | Gary Stein |
| 1994 | Touched by an Angel | Judge |
| 1994 | Chicago Hope | |
| 1994 | Fantastic Four | |
| 1994 | Trancers 4: Jack of Swords | Farr |
| 1994 | Trancers 5: Sudden Deth | Farr |
| 1994 | Phantom 2040 | |
| 1994 | Edith Ann: Homeless Go Home | Newscaster / Voice on the Loudspeaker (voice) |
| 1993 | Star Trek: Deep Space Nine | Captain Keogh |
| 1993 | Diagnosis: Murder | Dr. Leonard Gould |
| 1993 | Invisible: The Chronicles of Benjamin Knight | Dr. Knox |
| 1993 | Home Free | Ben Brookstone |
| 1992 | Batman: The Animated Series | Auctioneer (voice) |
| 1992 | Bionic Six | |
| 1992 | Jonah | Jonah (voice) |
| 1991 | Where's Wally? | (voice) |
| 1991 | Silk Stalkings | |
| 1991 | The Legend of Prince Valiant | Merlin |
| 1991 | Child of Darkness, Child of Light | George Beavier |
| 1991 | Music Machine | Growdy (voice) |
| 1991 | Absolute Strangers | Stevenson |
| 1991 | Lucy & Desi: Before the Laughter | Arthur Lyons |
| 1990 | TaleSpin | Principal Ed Pomeroy (voice) |
| 1990 | The Wizard of Oz | |
| 1990 | Shadow Strikers | Dr. Viper (voice) |
| 1989 | Quantum Leap | Earl Skinner |
| 1989 | Chip 'n' Dale Rescue Rangers | Plato / Aldrin Klordane (voice) |
| 1989 | Chip 'n' Dale Rescue Rangers | Captain Kernel (voice) |
| 1989 | リトル・ニモ | Oomp (voice) |
| 1989 | Fat Man and Little Boy | (voice) |
| 1989 | Coach | Dr. Alshire |
| 1989 | X-Men: Pryde of the X-Men | The Blob (voice) |
| 1989 | Blondie & Dagwood: Second Wedding Workout | Julius Dithers (voice) |
| 1988 | Scooby-Doo! and the Reluctant Werewolf | Mummy (voice) |
| 1988 | Moving | Mr. Cadell |
| 1988 | Murphy Brown | Eugene Kinsella |
| 1988 | BraveStarr: The Legend | Handlebar / Outlaw Scuzz / Stampede (voice) |
| 1988 | Superman | Jonathan Kent (voice) |
| 1988 | Slimer! and the Real Ghostbusters | Morris Grout (voice) |
| 1988 | Slimer! and the Real Ghostbusters | Goolem / Morris Grout (voice) |
| 1988 | Slimer! and the Real Ghostbusters | Goolem (voice) |
| 1987 | Star Trek: The Next Generation | Koroth |
| 1987 | Married... with Children | Mr. Foodie |
| 1987 | Teenage Mutant Ninja Turtles | Dr. Polidorius (voice) |
| 1987 | DuckTales | |
| 1987 | DuckTales | Colonel Beauregard DuBark (voice) |
| 1987 | BraveStarr | Diamondback / Handlebar / Outlaw Skuzz / Stampede |
| 1987 | The Smurfs: 'Tis the Season to Be Smurfy | Vanity Smurf / Doctor (voice) |
| 1987 | The Two Mrs. Grenvilles | Sam Rosenthal |
| 1987 | The Nativity | Wise Man (voice) |
| 1987 | Blondie & Dagwood | Julius C. Dithers (voice) |
| 1986 | Matlock | Dr. Linder |
| 1986 | L.A. Law | Judge Stephen Weeks |
| 1986 | Ghostbusters | Merlin / Prime Evil / Fangster / Captain Long John Scarechrome / Airhead |
| 1986 | Rambo | |
| 1986 | Chuck Norris: Karate Kommandos | Kimo (voice) |
| 1986 | Strong Medicine | Dr. Noah Townsend |
| 1986 | The Wuzzles: Bulls of a Feather | Rhinokey / Crock / Mr. Packcat (voice) |
| 1986 | Skeletor's Revenge | Skeletor / Man-At-Arms / Cringer / Battle Cat / Melaktha / Cat Spy (voice) |
| 1986 | Strong Medicine | Dr. Noah Townsend |
| 1985 | She-Ra: Princess of Power | Skeletor / Cringer / Announcer |
| 1985 | He-Man and She-Ra: The Secret of the Sword | Skeletor / Man-at-Arms / Cringer / Battle Cat / Bald Rebel / Chef Alan (voice) |
| 1985 | He-Man and She-Ra: A Christmas Special | Skeletor / Man-At-Arms / Zipper (voice) |
| 1985 | Mr. Belvedere | |
| 1985 | Wuzzles | Rhinokey/Crocosaurus |
| 1985 | The Execution | Max Langbein |
| 1985 | The Pound Puppies | Barkerville (voice) |
| 1985 | My Wicked, Wicked Ways: The Legend of Errol Flynn | Jerry Gersler |
| 1984 | Die unendliche Geschichte | Rockbiter / Falkor / G'mork / Narrator (voice) |
| 1984 | Murder, She Wrote | Dr. Raymond Auerbach |
| 1984 | The Transformers | |
| 1984 | Who's the Boss? | |
| 1984 | Night Court | Dr. Fine |
| 1984 | Night Court | Judge Crockett |
| 1984 | Challenge of the GoBots | |
| 1984 | The Smurfic Games | Vanity Smurf (voice) |
| 1983 | He-Man and the Masters of the Universe | Skeletor / Battle Cat / Cringer / Man-at-Arms / Mer-Man / Buzz-Off |
| 1983 | He-Man and the Masters of the Universe | |
| 1983 | Mama's Family | |
| 1983 | My Smurfy Valentine | (voice) |
| 1983 | Memorial Day | Stallings |
| 1983 | The Smurfs: Baby's First Christmas | Vanity Smurf (voice) |
| 1983 | The Smurfs Halloween Special | |
| 1982 | Knight Rider | General Duncton |
| 1982 | Knight Rider | Joe Lewis |
| 1982 | St. Elsewhere | |
| 1982 | The Smurfs Christmas Special | (voice) |
| 1982 | The Smurfs Springtime Special | Vanity Smurf (voice) |
| 1982 | Mighty Mouse in the Great Space Chase | Oil Can Harry (voice) |
| 1982 | Divorce Wars: A Love Story | Arthur Lazar |
| 1981 | Gimme a Break! | |
| 1981 | Blackstar | |
| 1981 | Macbeth | Duncan |
| 1981 | The Kid Super Power Hour with Shazam! | |
| 1981 | Foul Play | |
| 1981 | Trollkins | |
| 1980 | Private Benjamin | Rabbi |
| 1980 | The Plastic Man Comedy/Adventure Show | |
| 1980 | Take It to the Limit | Narrator (voice) |
| 1979 | Scooby-Doo and Scrappy-Doo | Mr. Percy |
| 1979 | Scooby-Doo and Scrappy-Doo | Mr. Husai |
| 1979 | Scooby-Doo and Scrappy-Doo | (voice) |
| 1979 | Hart to Hart | Cyrus St. Cyr |
| 1979 | The New Adventures of Flash Gordon | |
| 1979 | The New Adventures of Mighty Mouse and Heckle & Jeckle | Oil Can Harry / Swifty / Narrator (voice) |
| 1979 | Eischied | Captain Finnerty |
| 1979 | A Pleasure Doing Business | Marvin |
| 1979 | Blind Ambition | George Simonson |
| 1979 | You Can't Take it With You | FBI Man |
| 1978 | Vega$ | |
| 1978 | The Ghost of Flight 401 | Barton |
| 1978 | Record City | Blindman |
| 1978 | Peeping Times | Miles Rathbourne |
| 1978 | How to Survive the '70s and Maybe Even Bump Into Happiness | |
| 1978 | To Kill a Cop | Capt. Finnerty |
| 1977 | Soap | Mr. Kirby |
| 1977 | Lou Grant | |
| 1977 | Washington: Behind Closed Doors | Simon Cappell |
| 1977 | Tail Gunner Joe | Eisenhower Publicist |
| 1977 | Shake, Rattle and Roll | Sidney Merciless |
| 1976 | Freaky Friday | Mr Joffert |
| 1976 | Helter Skelter | Aaron Stovitz |
| 1976 | Alice | |
| 1976 | Riding with Death | Dr. Arthur Hale |
| 1976 | Gemini Man | |
| 1976 | The Gentleman Tramp | Narrator |
| 1975 | The Hindenburg | Albert Breslau |
| 1975 | S.W.A.T. | |
| 1975 | Barney Miller | William Deats |
| 1975 | The Ghost Busters | |
| 1975 | Win, Place or Steal | Lt. Mannite |
| 1975 | The Lives of Jenny Dolan | Springfield |
| 1975 | Fraidy Cat | Fraidy "Nine" Cat (voice) |
| 1975 | Big Eddie | |
| 1974 | The Six Million Dollar Man | Dr. Rudy Wells |
| 1974 | The Six Million Dollar Man | Rudy Wells |
| 1974 | Happy Days | |
| 1974 | Hong Kong Phooey | |
| 1974 | Petrocelli | |
| 1974 | Valley of the Dinosaurs | |
| 1974 | Death Sentence | Lubell |
| 1974 | Harry O | |
| 1974 | Cyrano | First Cadet / de Brigny (voice) |
| 1974 | Murder Works Overtime | Canavan |
| 1973 | Westworld | Chief Supervisor |
| 1973 | The Thief Who Came to Dinner | Insurance Man |
| 1973 | The Six Million Dollar Man: Wine, Women and War | Dr. Rudy Wells |
| 1973 | The Six Million Dollar Man: The Solid Gold Kidnapping | Dr. Rudy Wells |
| 1973 | Lotsa Luck | Monroe |
| 1973 | Chase | |
| 1973 | What Are Best Friends For? | Dr. Otto Ludwig |
| 1973 | Daddy's Girl | Bennett |
| 1972 | The Groundstar Conspiracy | General Hackett |
| 1972 | ABC Afterschool Special | |
| 1972 | Temperatures Rising | George |
| 1971 | Nichols | Averrel |
| 1971 | Inside O.U.T. | Edgar Winston |
| 1970 | Little Big Man | Major |
| 1970 | McCloud | |
| 1970 | The Partridge Family | Wink Burgess |
| 1970 | Three For Tahiti | Cecil Barrett |
| 1969 | The Courtship of Eddie's Father | Sy Freeman |
| 1969 | The Bill Cosby Show | |
| 1969 | Medical Center | |
| 1969 | The Bill Cosby Show | Dwight McDevitt |
| 1969 | The Maltese Bippy | Adolph Springer |
| 1969 | My World and Welcome to It | |
| 1968 | Star! | Andre Charlot |
| 1968 | Hawaii Five-O | Bernie Fryer |
| 1968 | Here's Lucy | Herb Hinkley |
| 1968 | Here's Lucy | Dr. Parker |
| 1968 | The Mod Squad | |
| 1968 | Uptight | Unctuous Man in Arcade (uncredited) |
| 1968 | How to Save a Marriage and Ruin Your Life | Everett Bauer |
| 1968 | The Name of the Game | Harvey |
| 1968 | Here Come the Brides | |
| 1968 | Lancer | |
| 1968 | The Outsider | |
| 1967 | In the Heat of the Night | Ted Appleton (uncredited) |
| 1967 | Ironside | |
| 1967 | Mannix | |
| 1967 | The High Chaparral | Sweets |
| 1967 | He & She | Murray Mouse |
| 1967 | Judd for the Defense | |
| 1966 | Gammera the Invincible | Dr. Contrare |
| 1966 | That Girl | |
| 1966 | Felony Squad | |
| 1965 | I Dream of Jeannie | Congressman Farragut |
| 1965 | Get Smart | |
| 1965 | Hogan's Heroes | Freitag |
| 1965 | Hogan's Heroes | Wilhelm |
| 1965 | Hogan's Heroes | Colonel Sitzer |
| 1965 | I Spy | Benkovsky |
| 1965 | The F.B.I. | Ludovic Krols |
| 1964 | Bewitched | |
| 1960 | The Flintstones | Additional Voices (voice) |
| 1960 | The Andy Griffith Show | Mr. Ruskin |
