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.
| Actor | Role |
|---|---|
 Sonny ChibaTachibana - Scientist / Space Chief | Tachibana - Scientist / Space Chief |
 Shinjirō EharaNot listed | Not listed |
 Ryuko MizukamiTanigawa Yoko | Tanigawa Yoko |
 Mitsue KomiyaNot listed | Not listed |
 Seiichirō KameishiNot listed | Not listed |
| SShiro OkamotoNot listed | Not listed |
 Rinichi YamamotoNot listed | Not listed |
| KKappei MatsumotoTanigawa Hiroshi | Tanigawa Hiroshi |
 Takashi KandaNot listed | Not listed |
 Ken SudoNot listed | Not listed |
| JJunji MasudaNot listed | Not listed |
| KKoji SaharaGarrison Chief Mikami | Garrison Chief Mikami |
| HHarold ConwayWashington Broadcast Station Chief | Washington Broadcast Station Chief |
| YYuji KitamineNot listed | Not listed |
| TTadashi MinamikawaNot listed | Not listed |
 Kōji SekiyamaNot listed | Not listed |
 Gōzō SōmaNot listed | Not listed |
 Akikane SawaNot listed | Not listed |
| MMasazumi OkabeNot listed | Not listed |
| SShirō ŌkiNot listed | Not listed |
| JJo MoriyaNot listed | Not listed |
| KKosaku OkanoNot listed | Not listed |
| KKenji TodorokiNot listed | Not listed |
| KKenji MiyakoNot listed | Not listed |
 Akira KatayamaNot listed | Not listed |