Gammera the Invincible (1966)

Gammera the Invincible follows the story of a giant turtle named Gamera, who is awakened from his arctic slumber by a nuclear explosion. As Gamera emerges, he begins a destructive rampage through Tokyo, causing chaos and destruction in his wake. The government and the United Nations must find a way to stop this fire-breathing monster before he destroys the entire city. With the threat of nuclear power plants and the Cold War looming, humanity is faced with a terrifying giant creature that they must catch and contain. Will they be able to stop Gamera before it's too late?