Gammera the Invincible

Albert Dekker

Secretary of Defense

Brian Donlevy

Gen. Terry Arnold

Diane Findlay

Sgt. Susan Embers

John Baragrey

Capt. Lovell

Dick O'Neill

Gen. O'Neill

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Mort Marshall

Jules Manning

Alan Oppenheimer

Dr. Contrare

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Steve Zacharias

Sen. Billings

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Thomas Stubblefield

J.T. Standish

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Gene Bua

Lt. Clark

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Bob Carraway

Lt. Simpson

John McCurry

A1C Hopkins

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Walter Arnold

American Ambassador

Louis Zorich

Soviet ambassador

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Robin Craven

British ambassador

Bernard Grant

Dr. Hidaka (voice)

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Larry Robinson

Aoyagi (voice)

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Paulette Rubinstein

Kyoke (voice)

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Lucy Martin

Nobuyo (voice)

Corinne Orr

Toshio (voice)