Gammera the Invincible (1965)

"Gammera the Invincible" is a Japanese kaiju film that introduces audiences to a colossal prehistoric turtle awakened by an atomic blast. As the giant turtle, Gamera, emerges, wreaking havoc and destruction, the world is thrust into chaos. Governments unite to confront this seemingly indestructible force. However, as the military efforts escalate, it becomes evident that Gamera may not be as malevolent as initially thought.