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Acting
Mark Lenard was an actor, perhaps best known for his many roles in the Star Trek universe. Lenard played a Klingon, a Romulan, and a Vulcan in the original '60s Star Trek TV show, and memorably played Sarek, Spock's Vulcan father, in several Star Trek movies and later TV shows.

Star Trek VI: The Undiscovered Country
as Sarek

The Radicals
as Eberhard Hoffman

In the Heat of the Night

Star Trek: The Next Generation
as Sarek

Star Trek IV: The Voyage Home
as Sarek

Otherworld
as Commander Perel Sightings

Star Trek III: The Search for Spock
as Ambassador Sarek

Farewell to the Planet of the Apes
as Urko

Life, Liberty and Pursuit on the Planet of the Apes
as Urko

Treachery and Greed on the Planet of the Apes
as Urko

The Forgotten City of the Planet of the Apes
as Urko

Back to the Planet of the Apes
as Urko

Star Trek: The Motion Picture
as Klingon Captain

Buck Rogers in the 25th Century
as Ambassador Duvoe
The Secret Empire
as Emperor Thorval

Cliffhangers
as Emperor Thorval

Getting Married
as Mr. Bloom

The Incredible Hulk

Annie Hall
as Navy Officer

Planet of the Apes
as Urko

Little House on the Prairie
as Peter Ingalls

Outrage!
as Mr. Chandler

The Magician
as Foley

Star Trek
as Sarek (voice) (uncredited)

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Alias Smith and Jones

Noon Sunday
as Jason Cootes

Here Come the Brides
as Aaron Stempel

Hawaii Five-O
as Yoshio Nagata

Hang 'em High
as Prosecutor

Mannix

Judd, for the Defense

Cimarron Strip

Mission: Impossible
as Colonel Bakram

Jericho
as Philippe

Felony Squad

Star Trek
as Sarek

The Wild Wild West

Run for Your Life
as Col. Sebastian Peralta

The Greatest Story Ever Told
as Balthazar

Another World

The Power and the Glory

The Defenders
as Assistant District Attorney Holloman

Gunsmoke
as Ira Stonecipher

Search for Tomorrow