Casting | Rôle |
|---|
| Frank Mullen | Dr. Paul Stewart / sailor (voices) |
| Barbara Laney | Akemi Togawa / nurse (voices) |
| Hal Archer | Dr. Yuzo Mamiya / air traffic controller / JSDF soldiers / diver (voices) |
| Nick Kendall | Major General Hashimoto / Professor Kita (voices) |
| Warren Rooke | Lt. Col. Kazama / reporter / radio announcer (voices) |
| Ralph Pixton | Hirai / JSDF staff officer / JSDF radio announcer / radio announcer / JSDF soldier (voices) |
| Barry Haigh | Chief Izumida / JSDF officer / reporter (voices) |