- HD 1080
- Runtime: 86m.
- Status: Released
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- Languages: en
- Country: United States of America, Japan
- Director: Sandy Howard, Noriaki Yuasa
- Stars: Albert Dekker, Brian Donlevy, Diane Findlay, John Baragrey, Dick O'Neill
- keywords: japan, monster, giant monster, turtle, rampage, alternate version, kaiju, gamera (giant turtle), tokusatsu
- Production_studio: World Entertainment Corp., Harris Associates, Ross-Gaffney, Inc., Titan Productions, Inc., Daiei Film
- Slogan: Can Plan Z stop... Gammera the Invincible
- providers: FlixFling
- The Gammera the Invincible is featured in the top rankings of 1966
- #46 in Top Action Movies of 1966
- #36 in Top Horror Movies of 1966
An atomic explosion awakens Gammera, a giant fire breathing turtle monster from his millions of years of hibernation.