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Gary Fred Merrill (August 2, 1915 – March 5, 1990) was an American film and television character actor whose credits included more than fifty feature films, a half-dozen mostly short-lived TV series, and dozens of television guest appearances. Description above from the Wikipedia article Gary Merrill, licensed under CC-BY-SA, full list of contributors on Wikipedia.

Titans of Destruction: The Evolution of Giant Monster Movies
as Self - (archive footage)

The Fabulous Allan Carr
as Self (archive)

The Littlest Hobo
as Willie Brogan

The Seekers
as Capt. Hull

World of Darkness
as Dr. Thomas Madsen

Thieves
as Street Man

For Liberty and Union
as Self - Narrator (voice)
The Zodiac Murders

Movin' On

Huckleberry Finn
as Pap

Murder and the Computer
as Gordon Craig

The Murderers

Pueblo
as Adm. Thomas E. Moorer

Kung Fu
as Dan Hoyle

Earth II
as Walter Dietrich

Young Dr. Kildare
as Dr. Leonard Gillespie

Cannon
Secret of the Sacred Forest
as Mike Parks

Medical Center

Marcus Welby, M.D.
as Orlando 'Cord' Corday

Loving Badly

Then Came Bronson
as Inspector Otis

Run, Psycho, Run
as George Dennison

The Power
as Mark Corlane

Clambake
as Sam Burton

The Incident
as Douglas McCann

Hondo and the Apaches
as General Philip Sheridan

Hondo

The Last Challenge
as Squint Calloway

The Dangerous Days of Kiowa Jones
as Marshal Duncan

The Time Tunnel
as Senator Leroy Clark

Destination Inner Space
as Dr. LaSatier

In Search of Hart Crane
as Narrator (voice)

Ride Beyond Vengeance
as Dub Stokes

Atomic Power Today: Service with Safety
as Narrator

Around the World Under the Sea
as Dr. August 'Gus' Boren

Catacombs
as Raymond Garth

Branded
Profiles in Courage
as John Marshall
Reporter

The Searching Eye
as Narrator

Kraft Suspense Theatre
as Mark Jordan
Bob Hope Presents the Chrysler Theatre

The Outer Limits
as Dr. James Hamilton / Major Roger Brothers

A Girl Named Tamiko
as Max Wilson

Combat!
as Capt. August

The Alfred Hitchcock Hour
as John Pemberton

Sam Benedict

Mysterious Island
as Gideon Spilitt

The New Breed
as Karl Lippert

Ben Casey

Bus Stop

The Pleasure of His Company
as James Dougherty

The Great Impostor
as Pa Demara

Winston Churchill: The Valiant Years
as Narrator

Outlaws

The Savage Eye
as The Poet

Rhapsody of Steel
as Narrator (voice)

The Wonderful Country
as Major Colton

The Twilight Zone
as Joseph Paradine