![Monster a Go-Go!](https://image.chilimovie.com/public/300px/20200519/aevO7SAayxvVtuzRCzlpjyXK9xX.jpg)
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American astronaut Frank Douglas mysteriously disappears from his spacecraft as it parachutes to Earth. He is apparently replaced by or turned into a large, radioactive, humanoid monster. A team of scientists and military men attempt to capture the monster.