Aliens from space plan to conquer the world using space monsters Gigan and King Ghidrah, which they control from their secret headquarters inside the head of the Godzilla-replica building at a theme park. The only thing that can stop them is the combined efforts of Godzilla and Anguirus.—Todd A. Bobenrieth
A manga artist becomes suspicious of his employers when a garbled message is discovered on tape. As he forms a team to investigate, Godzilla and Anguirus set out to help defeat the invaders.