Met de cyclotram, een atoom aangedreven rotsboorvoertuig, leidt Dr. Jerimiah Morley een expeditie naar een ondergrondse wereld.
Nee, helaas is Unknown World nog niet beschikbaar op Netflix in Nederland.
| Directing | Terry O. Morse | Director |
| Writing | Millard Kaufman | Screenplay |
| Production | Irving Block | Producer |
| Production | Jack Rabin | Producer |
| Sound | Ernest Gold | Original Music Composer |
| Camera | Henry Freulich | Director of Photography |
| Camera | Allen G. Siegler | Director of Photography |
| Editing | Terry O. Morse | Editor |
| Art | Irving Block | Production Design |
| Art | Jack Rabin | Production Design |
| Visual Effects | Irving Block | Visual Effects |
| Visual Effects | Jack Rabin | Visual Effects |
| Production | Glenn Cook | Production Supervisor |
| Sound | Marshall Pollock | Sound Effects Editor |
| Camera | Lester Shorr | Camera Operator |
| Art | Glenn P. Thompson | Set Decoration |
| Costume & Make-Up | Kiva Hoffman | Makeup Artist |
| Costume & Make-Up | Mickey Meyers | Wardrobe Designer |
