A mysterious extraterrestrial being resembling Godzilla rapidly approaches Earth. The monster, dubbed SpaceGodzilla, lands to challenge the King of the Monsters.
| Actor | Role |
|---|---|
| JJun HashizumeLieutenant Koji Shinjo | Lieutenant Koji Shinjo |
 Megumi OdakaMiki Saegusa | Miki Saegusa |
| ZZenkichi YoneyamaLieutenant Kiyoshi Sato | Lieutenant Kiyoshi Sato |
 Akira NakaoColonel Takaaki Aso | Colonel Takaaki Aso |
 Yousuke SaitoDr. Susumu Okubo | Dr. Susumu Okubo |
 Koichi UedaDeputy Commander Hyodo | Deputy Commander Hyodo |
 Kenji SaharaMinister Takayuki Segawa | Minister Takayuki Segawa |
| TTowako YoshikawaDr. Chinatsu Gondo | Dr. Chinatsu Gondo |
 Akira EmotoMajor Akira Yuki | Major Akira Yuki |
 Keiko ImamuraCosmos | Cosmos |
 Sayaka OsawaCosmos | Cosmos |
 Kenpachirō SatsumaGodzilla | Godzilla |
| RRyo HariyaSpaceGodzilla | SpaceGodzilla |
| WWataru FukudaM.O.G.U.E.R.A. | M.O.G.U.E.R.A. |
| LLittle FrankyLittle Godzilla | Little Godzilla |
 Houka KinoshitaMoguera Pilot | Moguera Pilot |
 Toru MinegishiColonel Goro Gondo (archival footage) (uncredited) | Colonel Goro Gondo (archival footage) (uncredited) |