A party of archaeologists discovers the remnants of a five millennia-old mutant Sumerian civilization living beneath a glacier atop a mountain in Mesopatamia.
| Actor | Role |
|---|---|
 John AgarDr. Roger Bentley | Dr. Roger Bentley |
 Cynthia PatrickAdad | Adad |
 Hugh BeaumontDr. Jud Bellamin | Dr. Jud Bellamin |
 Alan NapierElinu, the High Priest | Elinu, the High Priest |
 Nestor PaivaProf. Etienne Lafarge | Prof. Etienne Lafarge |
 Phil ChambersDr. Paul Stuart | Dr. Paul Stuart |
 Rodd RedwingNazar | Nazar |
 Robin HughesFirst Officer | First Officer |
 Eddie ParkerMole Person | Mole Person |
 Frank BaxterSelf (as Dr. Frank C. Baxter) | Self (as Dr. Frank C. Baxter) |
 Robert F. HoyMole Person | Mole Person |
| JJoe AbdullahNot listed | Not listed |
| YYvonne de LavalladeNot listed | Not listed |
| JJohn DodsworthNot listed | Not listed |
| AArthur D. GilmourNot listed | Not listed |
| MMarc HamiltonNot listed | Not listed |
 Bob HerronNot listed | Not listed |
 Kay E. KuterNot listed | Not listed |
| JJames LoganNot listed | Not listed |
| BBilly MillerNot listed | Not listed |
| JJoe RubinoNot listed | Not listed |
| PPatrick WhyteNot listed | Not listed |