- Country: Japan, USA
- Genres: Action, Family, Sci-Fi
- Release: 1966-12-15
- Director: Sandy Howard , Noriaki Yuasa
- Writers: Richard Kraft , Nisan Takahashi
- Language: English
- Stars: Albert Dekker (1905–1968) , Brian Donlevy , Diane Findlay , John Baragrey , Dick O’Neill , Mort Marshall , Bob Carraway
- Runtime: 86 min
- Awards: N/A
- AKA: Gammera the Invincible (Canada) , Gammera - O Monstro Invencível (Brazil) , Gammera (United States of America) , Gammera the Invincible , Gammera invincibilul (Romania) , Gammera the Invincible (United States of America) , Gammera the Invincible (Italy) , Gamera the Invincible (United Kingdom)
- Plot: An atomic explosion awakens Gammera--a giant, fire-breathing turtle monster--from his millions of years of hibernation. Enraged at being roused from such a sound sleep, he takes it out on Tokyo.
- IMDB:tt0434964
Gammera the Invincible Cast · · · ALL
Sandy Howard
Director
Noriaki Yuasa
Director
Albert Dekker
(1905–1968)
Secretary of Defense
Brian Donlevy
Gen. Terry Arnold
Diane Findlay
Sgt. Susan Embers
John Baragrey
Capt. Lovell
Dick O’Neill
Gen. O'Neill
Eiji Funakoshi
Dr. Hidaka
Michiko Sugata
Nobuyo
Harumi Kiritachi
Kyoke
Mort Marshall
Jules Manning
Bob Carraway
Lt. Simpson
Alan Oppenheimer
Dr. Contrare
John McCurry
A1C Hopkins
Steve Zacharias
Sen. Billings
Walter Arnold
American Ambassador
Thomas Stubblefield
J.T. Standish