A Japanese geologist discovers that dinosaurs still exist in caves beneath the surface of a volcanic lake.
| Actor | Role |
|---|---|
 Tsunehiko WataseTakashi Ashizawa | Takashi Ashizawa |
 Shōtarō HayashiAkira Taniki | Akira Taniki |
 Yōko KoizumiAkiko Osano | Akiko Osano |
| TTomoko KiyoshimaJunko Sonoda | Junko Sonoda |
| FFuyukichi MakiShohei Muku | Shohei Muku |
 Kinji NakamuraHideyuki Sakai | Hideyuki Sakai |
 Hiroshi NawaMasahiko Miyawaki | Masahiko Miyawaki |
 Masataka IwaoNot listed | Not listed |
 Takashi NoguchiNot listed | Not listed |
 Masaharu ArikawaNot listed | Not listed |
| AAkira MoroguchiNot listed | Not listed |