Attack From Space (1965)

Stars: Ken Utsui, Utako Mitsuya, Sachihiro Ohsawa
Directors: Koreyoshi Akasaka, Teruo Ishii

Benevolent aliens from the planet Emerald send superhero Starman to protect Earth from invasion by an evil alien race called the Spherions. When Starman arrives on Earth, he discovers a conspiracy involving Earth's top scientists, and he must root out the traitors and also stop the impending alien invasion.