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Watch War of the Monsters online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

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.