Invasion of the Neptune Men_
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.
Starring
Sonny Chiba, Shinjirō Ehara, Ryuko Mizukami
Updated Feb 16, 2026
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Cast
Sonny Chiba →
Sonny Chiba stars as Tachibana - Scientist / Space Chief in Invasion of the Neptune Men.
Sonny Chiba →
Year context
Invasion of the Neptune Men was released 65 years ago in 1961.
Overview
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 metal...
Invasion of the Neptune Men is a Science Fiction, Action, Adventure film with a runtime of 1h 14m.
CAST (20)
Sonny Chiba
Tachibana - Scientist / Space Chief
Shinjirō Ehara
Ryuko Mizukami
Tanigawa Yoko
Mitsue Komiya
Seiichirō Kameishi
SO
Shiro Okamoto
Rinichi Yamamoto
KM
Kappei Matsumoto
Tanigawa Hiroshi
Takashi Kanda
Ken Sudo
Junji Masuda
KS
Koji Sahara
Garrison Chief Mikami
HC
Harold Conway
Washington Broadcast Station Chief
YK
Yuji Kitamine
TM
Tadashi Minamikawa
Kōji Sekiyama
Gōzō Sōma
Akikane Sawa
MO
Masazumi Okabe
Shirō Ōki
DETAILS
FREQUENTLY ASKED QUESTIONS
What is Invasion of the Neptune Men about?
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.
How long is Invasion of the Neptune Men?
Invasion of the Neptune Men has a runtime of 74 minutes (1h 14m).
Who stars in Invasion of the Neptune Men?
The cast of Invasion of the Neptune Men includes Sonny Chiba, Shinjirō Ehara, Ryuko Mizukami, Mitsue Komiya, Seiichirō Kameishi.
What is the rating of Invasion of the Neptune Men?
Invasion of the Neptune Men has a rating of 2.8 out of 10 based on 27 votes on TMDB.
GENRES (3)
Science Fiction
Action
Adventure