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Invasion of the Neptune Men
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You can watch Invasion of the Neptune Men (1961) for free on Hoopla.
Astronomer Shinichi Tachibana has a secret identity as the superhero "Iron Sharp" and is well beloved by children. When they are attacked by a group of metallic aliens, Iron Sharp drives the aliens away. The resourceful Tachibana helps develop an electric barrier to block the aliens from coming to the Earth. After several losses by the aliens, they announce that they will invade the Earth, throwing the world into a state of panic.
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Director
Koji Ota
Cast
Sonny Chiba, Shinjirō Ehara, Ryuko Mizukami, Mitsue Komiya, Seiichirō Kameishi, Shiro Okamoto, Rinichi Yamamoto, Kappei Matsumoto, Takashi Kanda, Ken Sudo
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Invasion of the Neptune Men
You can watch Invasion of the Neptune Men (1961) for free on Hoopla.
Director
Koji Ota
Cast
Sonny Chiba, Shinjirō Ehara, Ryuko Mizukami, Mitsue Komiya, Seiichirō Kameishi, Shiro Okamoto, Rinichi Yamamoto, Kappei Matsumoto, Takashi Kanda, Ken Sudo
9 options ranked by value · 🇺🇸 United States
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alien invasion · planet neptune
Watch Invasion of the Neptune Men for free on Hoopla. Watch Invasion of the Neptune Men for free on Plex. Watch Invasion of the Neptune Men for free on Plex Channel. Invasion of the Neptune Men is streaming on AMC+. Invasion of the Neptune Men is streaming on Philo. Invasion of the Neptune Men is streaming on YouTube TV. Invasion of the Neptune Men is streaming on AMC. Invasion of the Neptune Men is streaming on AMC+ Amazon Channel. Invasion of the Neptune Men is streaming on Shout! Factory Amazon Channel. Availability last verified April 7, 2026.