(1999) Inspector Gadget

as Artemus Bradford

(1995) Batman Forever

as Dr. Burton

(2007) Scooby-Doo: Agence toutou risques, vol. 2 : Le fantôme de la télé

as (voice)

(2007) Scooby-Doo: Agence toutou risques, vol. 1 : Le voleur de vélo

as (voice)

(1989) The Little Mermaid

as Louis (voice)

(1982) The Last Unicorn

as The Skull (voice)

(1970) M*A*S*H

as Father John Mulcahy

(1992) The Player

as René Auberjonois

(1976) King Kong

as Roy Bagley

(2000) Geppetto

as Prof Buonragazzo

(1998) An American Tail: The Treasure of Manhattan Island

as Dithering (voice)

(1964) Lilith

as Howie (uncredited)

(1989) Little Nemo: Adventures in Slumberland

as Professor Genius (voice)

(1986) 3:15 the Moment of Truth

as Horner

(1970) Brewster McCloud

as The Lecturer

(1980) Where the Buffalo Roam

as Harris

(2019) The Circuit

as ---

(2007) Chill Out, Scooby-Doo!

as Alphonse LaFleur (voice)

(1986) The Christmas Star

as Sumner

(1987) Walker

as Maj. Siegfried Hennington

(1978) Eyes of Laura Mars

as Donald Phelps

(1971) McCabe & Mrs. Miller

as Sheehan

(1972) Images

as Hugh

(2008) Hornswiggle

as Hornswiggle (voice)

(2000) Joseph: King of Dreams

as Butler (voice)

(1982) The Kid From Nowhere

as Howard

(1975) The Hindenburg

as Major Napier

(1993) Star Trek: Deep Space Nine - Emissary

as Odo

(1995) Star Trek: Deep Space Nine - The Way of the Warrior

as Odo

(1976) The Big Bus

as Father Kudos

(1993) The Ballad of Little Jo

as Streight Hollander

(1992) The Lost Language of Cranes

as Geoffrey Lane

(1979) The Wild Wild West Revisited

as Capt. Sir David Edney

(1989) A Connecticut Yankee in King Arthur's Court

as Merlin

(2002) Witness to Hope: The Life of Karol Wojtyla, Pope John Paul II

as Narrator (voice)

(1972) Pete 'n' Tillie

as Jimmy Twitchell

(2002) Woodrow Wilson

as voice

(2012) Get a Life!

as Himself

(2000) Sally Hemings: An American Scandal

as James Callender

(1973) The Birdmen

as Halden Brevik / Olav Volda

(2001) Burning Down the House

as Pierre

(2013) The Sixth Gun

as Von Allen / Montcrief

(1973) Shirts/Skins

as Sidney Krebs

(1989) The Feud

as Reverton

(2009) Le Door

as Le Door

(1997) Snide and Prejudice

as Dr. Sam Cohen

(1987) My Best Friend Is a Vampire

as Modoc

(2004) Eulogy

as Parson Banke

(1992) Ned Blessing: The True Story Of My Life

as Marquis

(2013) Evermore

as Grandpa

(1976) Panache

as Panache

(2014) Planes: Fire & Rescue

as Concierge (voice)

(1992) The Sands of Time

as Prime Minister

(1997) Los Locos

as Presidente

(1993) Star Trek: Deep Space Nine - Behind the Scenes

as Himself

Cortex

as Parks

(2000) The Little Mermaid II: Return to the Sea

as Chef Louis (voice)

(2002) Tarzan & Jane

as (voice)

(1991) Absolute Strangers

as Quinn

(1988) Longarm

as Gov. Lew Wallace

(2016) Certain Women

as Albert

(1996) The Making of Star Trek Deep Space Nine Trials And Tribble-ations

as Self

(2011) The Captains

as Self

(2000) The Patriot

as Reverend Oliver

(2016) Blood Stripe

as Art

(1982) The Smurfs Christmas Special

as Stranger (voice)

(1986) A Smoky Mountain Christmas

as Ned

(1983) Sleeping Beauty

as King Boris

(1982) The Tale of the Frog Prince

as King Ulrich

(1980) More Wild Wild West

as Capt. Sir David Edney

(1992) Wild Card

as Jake Spence

(1979) Once Upon a Midnight Scary

as Ichabod Crane

(2015) This Is Happening

as Cal Plotz

(1997) Cats Don't Dance

as Flanigan (voice)

(2001) The Princess Diaries

as Philippe Renaldi (uncredited)

(1968) Petulia

as Fred Six (uncredited)

(2018) What We Left Behind: Looking Back at Star Trek: Deep Space Nine

as Self

(2003) Trials and Tribble-ations: Uniting Two Legends

as Himself

(2019) Windows on the World

as Maury

(2008) Dispatches from Nicaragua

as ---

(1971) Teenage Tease

as ---

(1971) Once Upon a Dead Man

as Andre Stryker

(2019) Raising Buchanan

as President James Buchanan

(2020) First Cow

as Man with Raven

(1999) We All Fall Down

as Tim

(2016) Way Out on a Limb

as Self

(2005) Family Guy Presents: Stewie Griffin: The Untold Story

as Odo (voice)

(1973) Incident at Vichy

as Monceau, An Actor

(1974) King Lear

as Edgar

(2007) Andrew Jackson: Good, Evil & The Presidency

as James Parton (voice)

(1988) Police Academy 5: Assignment Miami Beach

as Tony

(2000) Enlisted: The Story of 'M*A*S*H'

as Self

(1975) Upcoming Season

as Roberts

(2005) Geppetto's Secret

as Mr. Sneap

(1996) Nash Bridges

as ---

(1984) Murder, She Wrote

as Prof. Harry Papasian

(2000) The Secret Adventures of Jules Verne

as ---

(2001) Star Trek: Enterprise

as Ezral

(1993) Star Trek: Deep Space Nine

as Odo

(1972) The Rookies

as ---

(1999) Family Guy

as Odo (voice)

(1980) Tenspeed and Brown Shoe

as ---

(1979) Mrs. Columbo

as ---

(1974) Rhoda

as ---

(2003) Xiaolin Showdown

as Master Fung (voice)

(1984) Challenge of the GoBots

as ---

(1987) DuckTales

as Dr. Nogood (voice)

(1986) L.A. Law

as Kevin Richardson

(1975) Starsky & Hutch

as ---

(1999) Judging Amy

as Judge Jackson Keeler

(1979) Benson

as Clayton Endicott III

(1986) Matlock

as ---

(1976) The Bionic Woman

as ---

(1989) Doogie Howser, M.D.

as ---

(2001) The Legend of Tarzan

as Renard Dumont (voice)

(1975) The Jeffersons

as ---

(2001) Disney's House of Mouse

as ---

(1994) Aladdin

as Nefir Hasenuf (voice)

(1976) Charlie's Angels

as Terrence

(1993) Frasier

as William Tewksbury

(1968) The Mod Squad

as ---

(1977) Man from Atlantis

as Havergal

(1997) The Practice

as Judge F. Mantz

(1996) Captain Simian & the Space Monkeys

as Gardener / Alien Gladioluses (voice)

(1979) Hart to Hart

as Donald Springfield

(1984) Snorks

as Dr. Strangesnork

(1970) Night Gallery

as ---

(1982) Faerie Tale Theatre

as King Boris

(1975) Wonder Woman

as Kimball

(1997) Stargate SG-1

as Alar

(1994) Chicago Hope

as ---

(1974) Harry O

as ---

(1986) Wildfire

as ---

(1985) The Super Powers Team: Galactic Guardians

as ---

(2007) Saving Grace

as ---

(2009) Archer

as Mannfred (voice)

(1975) Ellery Queen

as ---

(1986) Blacke's Magic

as ---

(1995) The Savage Dragon

as Horde (voice)

(1979) Stockard Channing: In Just Friends

as ---

(1992) Raw Toonage

as Chef Louie (voice)

(2012) Ben 10: Omniverse

as Azmuth (voice)

(1993) Marsupilami

as Chef Louie (voice)

(2010) Young Justice

as Mark Desmond (voice)

(2001) Justice League

as Kanjar-Ro / Galius Zed / Guardian of Oa (voice)

(2001) Justice League

as Desaad / General Steppenwolf / Minion (voice)

(1998) The Wild Thornberrys

as Merrick Dash (voice)

(2001) Justice League

as Galius Zed / Kalanorian (voice)

(2005) It's Always Sunny in Philadelphia

as Dr. Larry Meyers

(1992) Batman: The Animated Series

as Dr. March (voice)

(1996) Richie Rich

as Richard Rich, Chef Pierre, Professor Keenbean

(2009) Warehouse 13

as Hugo Miller

(1973) Super Friends

as Desaad (voice)

(2011) The Looney Tunes Show

as Pepé Le Pew (voice)

(2004) Boston Legal

as Paul Lewiston

(2010) Pound Puppies

as McLeish (voice)

(2021) Star Trek: Prodigy

as Odo (voice)

(2008) Random! Cartoons

as Hornswiggle / Apeman #2 (voice)

(1995) The Outer Limits

as Dlavan

(2009) The Good Wife

as Coroner Claypool

(1984) Murder, She Wrote

as Homicide Captain Walker Thorn

(1999) Xyber 9: New Dawn

as Xyber 9 (voice)

(1978) The Dark Secret of Harvest Home

as Jack Stump

(1991) Eerie, Indiana

as The Donald

(1988) American Experience

as Woodrow Wilson (voice)

(1988) American Experience

as Alexander Hamilton (voice)

(1977) The Rhinemann Exchange

as Dr. Eugene Lyons

(1974) The Lives of Benjamin Franklin

as ---

(1974) Harry O

as Rabbit (1 episode)

(1976) Baa Baa Black Sheep

as Matthew Hooper

(2005) Criminal Minds

as Colonel Ron Massey

(1982) Faerie Tale Theatre

as King Ulrich

(1997) Extreme Ghostbusters

as ---

(2010) BlackBoxTV Presents

as Rudy

(1974) The Rockford Files

as Masters

(1962) The Jetsons

as (voice)

(2013) Masters of Sex

as Dr. George Papanikolaou

(2013) Wander Over Yonder

as Maurice (voice)

(2005) Grey's Anatomy

as Neil Sheridan

(1980) Beyond Westworld

as Power

(1956) Tony Awards

as Self - Nominee

(1976) Charlie's Angels

as Freddie Fortune

(2009) Archer

as Cardinal Giancarlo Morelli (voice)

(2013) The Captains Close Up

as Self

(1992) Lucky Luke

as Mr. Edgar Rockbottom / Mendez

(2012) 1600 Penn

as Winslow Hannum

(2000) Sally Hemings: An American Scandal

as James Callender

(1996) The Great War and the Shaping of the 20th Century

as Jean Jaures / Mustafa Kemal Ataturk (voice)

(1990) Tom & Jerry Kids Show

as Pierre (voice)

(2005) Avatar: The Last Airbender

as Mechanist (voice)

(2014) The Librarians

as Mr. McGuire

(1971) Great Performances

as Edgar

(2005) Avatar: The Last Airbender

as Gan Jin Leader (voice)