Film •
The Greatest Story Ever Told (1965) - Balthazar • ''
Hang 'Em High'' (1968) - Prosecuting Attorney at Fort Grant •
Noon Sunday (1970) - Jason Cootes •
Annie Hall (1977) - Navy Officer •
Getting Married (1978) - Mr. Bloom •
Star Trek: The Motion Picture (1979) - Klingon Captain •
Star Trek III: The Search for Spock (1984) - Ambassador
Sarek •
Star Trek IV: The Voyage Home (1986) - Ambassador Sarek •
Star Trek V: The Final Frontier (1989) - Ambassador Sarek (voice) •
The Radicals (1990) - Eberhard Hoffmann •
Star Trek VI: The Undiscovered Country (1991) - Ambassador Sarek
Television •
Studio One (1960) - David •
Search for Tomorrow (1959–1960) - Nathan Walsh •
Armstrong Circle Theatre: "Ghost Bomber: The Lady Be Good" (1960) - Major Bennett •
Family Classics: The Three Musketeers (1960) - Jusac De Rochefort •
Another World (1964–1965) - Dr. Ernest Gregory •
Mission: Impossible: "
Wheels" (S1:E7, 1966) - Felipe Mora •
Star Trek: "
Balance of Terror" (S1:E14, 1966) -
Romulan Commander •
Star Trek: "
Journey to Babel" (S2:E10, 1967) -
Sarek •
Mission: Impossible: "
Trek" (S2:E2, 1967) - Col. Luis Cardoza •
The Wild Wild West: "The Night of the Iron Fist" (S3:E14, 1967) - Count Draja •
Cimarron Strip: "The Greeners" (S1:E23, 1968) - Jared Arlyn •
Gunsmoke: "No Where to Run" (S13:E18, 1968) - Ira Stonecipher •
Here Come the Brides (1968–1970) - Aaron Stempel •
Mission: Impossible: "
Nitro" (S3:E21, 1969) - Aristo Skora •
Hawaii Five-O: "To Hell with Babe Ruth" (1969) - Yoshio Nagata •
Mission: Impossible: "
The Rebel" (1970) - Colonel Bakram •
Hawaii Five-O: "Will the Real Mr. Winkler Please Die" (S5:E19, 1973) - Rogloff •
The Rookies: "Life Robbery" (S1:E21, 1973) - Fred Cox •
Star Trek: The Animated Series: "
Yesteryear" (1973) - Sarek (voice) •
Mannix: "
Desert Run" (1973) - Hal Morgan •
Chopper One: "The Informer" (1974) - Assistant D.A. Jim Dugan •
Planet of the Apes (1974) - General Urko •
Hawaii Five-O: "Secret Witness" (1974) - Dan Bok •
Little House on the Prairie: "Journey in the Spring" (1976) - Peter Ingalls •
The Bob Newhart Show: "Carlin's New Suit" (1977) - Earl Stanley Plummer •
Hawaii Five-O: "You Don't See Many Pirates These Days" (1977) - Commander Hawkins •
The Secret Empire (TV series) (1979) - Emperor Thorval •
The Incredible Hulk (TV series) (1979) - Mr. Slater •
Buck Rogers in the 25th Century: "Journey to Oasis" (1981) - Ambassador Duvoe •
Otherworld "The Zone Troopers Build Men" (1985) - Perel Sightings •
Star Trek: The Next Generation: "
Sarek" (1990) -
Sarek •
Star Trek: The Next Generation: "
Unification: Part 1" (1991) -
Sarek •
In the Heat of the Night: "Legacy" (1993) - Horrace Sloan (final appearance) •
Amazing Space on TLC (1993) ==References==