A young European boy living in San Francisco is reluctant to marry his long-term girlfriend because he wants to travel around the world first. His wealthy uncle agrees to send him on a global expedition aboard his ship, but en route the boy and his travelling companion are shipwrecked on a remote island, populated by countless prehistoric creatures as well as gold-hunting bandits.
Unfortunately the movie Mystery on Monster Island is not yet available on HBO Max.
| Production | Juan Piquer Simón | Producer |
| Writing | Joaquín Grau | Writer |
| Directing | Juan Piquer Simón | Director |
| Writing | Juan Piquer Simón | Writer |
| Camera | Andrés Berenguer | Director of Photography |
| Writing | Ron Gantman | Writer |
| Costume & Make-Up | Tony Pueo | Costume Design |
| Sound | Carlos Villa | Original Music Composer |
| Costume & Make-Up | Pedro Camacho | Makeup Artist |
| Writing | Jules Verne | Novel |
| Sound | Alfonso Agullo | Original Music Composer |
| Editing | Earl Watson | Editor |
| Art | Gumersindo Andrés | Art Direction |
| Art | Emilio Ruiz del Río | Production Design |
| Production | Francisco Ariza | Production Manager |
| Editing | Rafael de la Cueva | Editor |
| Sound | Alejandro Monroy | Original Music Composer |
