The U.N.G.C.C. (United Nations Godzilla Countermeasure Center) recovers the remains of Mecha-King Ghidorah and construct Mechagodzilla as a countermeasure against Godzilla. Meanwhile, a giant egg is discovered along with a new monster called Rodan. The egg is soon found to be none other than an infant Godzillasaurus.
| Actor | Role |
|---|---|
 Masahiro TakashimaKazuma Aoki | Kazuma Aoki |
 Ryoko SanoAzusa Gojo | Azusa Gojo |
 Megumi OdakaMiki Saegusa | Miki Saegusa |
 Daijirō HaradaNot listed | Not listed |
| IIchirota MiyagawaNot listed | Not listed |
 Yūsuke KawazuProfessor Omae | Professor Omae |
 Akira NakaoCommander Takaki Aso | Commander Takaki Aso |
 Koichi UedaGeneral Hyodo | General Hyodo |
| LLeo MeneghettiDr. Asimov | Dr. Asimov |
 Kenji SaharaMinister Takayuki Segawa | Minister Takayuki Segawa |
 Shinobu NakayamaYuri Katagiri | Yuri Katagiri |
 Sayaka OsawaPsychic Schoolteacher | Psychic Schoolteacher |
 Keiko ImamuraPsychic Schoolteacher | Psychic Schoolteacher |
| AAndy SmithAndrew Johnson | Andrew Johnson |
 Shelley SweeneySusan | Susan |
 Tadao TakashimaChief Hosono | Chief Hosono |
| WWataru FukudaMekagojira | Mekagojira |
| ''Hurricane' Ryu HarikenBebigojira | Bebigojira |
 Kenpachirō SatsumaGojira | Gojira |
| TTokuju MasudaNot listed | Not listed |