1980 - 1986 - Benson (Clayton Endicott III)
1993 - 1999 - Star Trek: Deep Space Nine (Constable Odo)
2001 - 2001 - Justice League (Kanjar-Ro/Ganthet) ('In Blackest Night')
Tv Movies:
1971 - Once Upon a Dead Man (Andre Stryker)
1971 - The Birdmen (Halden Brevik/Olav Volda)
1973 - Shirts/Skins (Sidney Krebs)
1973 - Incident at Vichy (Monceau, An Actor)
1974 - King Lear (Edgar)
1976 - Panache (Panache)
1979 - Kate Loves a Mystery (Monsieur Gerard)
1979 - The Wild Wild West Revisited (Captain Sir David Edney)
1979 - Once Upon a Midnight Scary (Ichabod Crane)
1982 - The Kid from Nowhere (Howard)
1983 - Sleeping Beauty (King Boris)
1986 - The Christmas Star (Sumner)
1986 - A Smoky Mountain Christmas
1988 - Longarm (Governor Lew Wallace)
1989 - Billy the Kid
1989 - A Connecticut Yankee in King Arthur's Court (Merlin)
1991 - Absolute Strangers (Quinn)
1991 - The Lost Language of Cranes (Geoffrey Lane)
1992 - Ned Blessing: The True Story of My Life (Marquis)
1992 - Wild Card (Jake Spence)
1992 - Sidney Sheldon's The Sands of Time
1995 - Edgar Allan Poe: Terror of the Soul (Fortunato) (ep. The Cask
of Amontillado)
2000 - Sally Hemings: An American Scandal (James Callender)
2000 - Geppetto (Professor Buonragazzo)
Specials and Mini Series:
1977 - The Rhinemann Exchange (TV Mini Series (Dr. Eugene Lyons)
1978 - Dark Secret of Harvest Home (TV Mini Series (Jack Stump)
1983 - Reilly: The Ace of Spies (TV Mini Series)
1991 - Ashenden (TV Mini Series)
1993 - Star Trek: Deep Space Nine - Behind the Scenes (Himself)
1999 - Star Trek: Deep Space Nine Companion (Constable Odo)
Voice Acting and Narration:
1962 - The Jetsons (voice) (Additional Voices) (1962-1963,1985-1987)
1981 - The Smurfs (voice) (Additional Voices)
1982 - The Last Unicorn (voice) (The Skull)
1984 - SuperFriends: The Legendary Super Powers Show (voice) (DeSaad)
1984 - Challenge of the GoBots (voice) (Dr. Braxis)
1984 - The Snorks (voice) (Dr. Strangesnork/Additional Voices)
1984 -Guardians (voice) (DeSaa)
1984 - Wildfire (voice) (Alvinar \The Super Powers Team: Galactic)
1988 - Scooby-Doo and the Ghoul School (voice) (Baxter)
1989 - The Little Mermaid (voice) (Louis)
1989 - Billy the Kid (voice) (Additional Voices)
1991 - Pirates of Darkwater (1991) TV Series (voice)
1991 - Mighty Max (1991) TV Series (voice) (Arachnoid/Dr. Stanley Kirby/Nadja)
1992 - Little Nemo: Adventures in Slumberland (voice)
(Professor Genius/The Nightmare King)
1993 - Aladdin (voice) (Nefir Hasenuf/Additional Voices)
1994 - Marsupilami (voice)
1996 - Bruno the Kid (voice) (Leonard DaLinguini)
1996 - Captain Simian & The Space Monkeys (voice) (Additional Voices)
1996 - The Great War and the Shaping of the 20th Century (voice) (Himself)
1996 - The Savage Dragon (voice) (Additional Voices)
1997 - Cats Don't Dance (voice) (Flanigan)
1999 - Gabriel Knight: Blood of the Sacred, Blood of the Damned (voice)
(Taxi Driver/Bigout)
1999 - Star Trek: Deep Space Nine - The Fallen (voice) (Constable Odo)
1999 - Xyber 9: New Dawn (voice) (Xyber 9)
2000 - An American Tail: The Treasure of Manhattan Island (voice) (Dithering)
2000 - Little Mermaid II: Return to the Sea, The (voice) (Chef Louis)
2000 - Joseph: King of Dreams (voice) (Butler)
2001 - House of Mouse (voice) (Chef Louie)
2001 - The Legend of Tarzan (voice) (Renard Dumont)
2002 - Blood Omen II: Legacy of Kain (voice) (Janos Audron, The Beast)
2002 - Command & Conquer: Renegade (voice) (Doctor Moebius)
Movies:
1964 - Lilith (Howie)
1968 - Petulia (Salesman)
1971 - MASH (Father John Patrick 'Dago Red' Mulcahy)
1970 - Brewster McCloud (The Teacher)
1971 - McCabe & Mrs. Miller (Sheehan)
1972 - Pete 'n' Tillie (Jimmy Twitchell)
1972 - Images (Hugh)
1975 - The Hindenburg (Major Napier)
1976 - The Big Bus (Father Kudos)
1976 - King Kong (Bagley)
1978 - Eyes of Laura Mars (Donald Phelps)
1980 - Where the Buffalo Roam (Harris From the Post)
1983 - Teenage Tease
1997 - 3:15 (Principal Horner)
1991 - Police Academy 5: Assignment: Miami Beach (Tony)
1987 - Walker (Major Siegfried Hennington)
1988 - My Best Friend Is a Vampire (Modoc)
1989 - The Feud (1989) .... Reverton)
1991 - Star Trek VI: The Undiscovered Country (Colonel West)
1992 - The Player (Himself)
1993 - The Ballad of Little Jo (Streight Hollander)
1995 - Batman Forever (Dr. Burton, at Arkham Asylum)
1997 - Los Locos ((Presidente)
1998 - Snide and Prejudice (Dr. Sam Cohen)
1999 - Inspector Gadget (Professor Artemus Bradford) (Brenda's Dad)
2000 - The Patriot (Reverend Oliver)
2000 - We All Fall Down (Tim)
2000 - Legacy of Kain: Soul Reaver II (Janos Audron)
2002 - Woodrow Wilson & the Birth of the American Century (Woodrow Wilson)
Plays:
Director:
1987 - Marblehead Manor (ep. Fondle Workout
Gorilla My Dreams)
1993 - Star Trek: Deep Space Nine (multiple episodes)
Writer: