Giants Mollusks are released from the earth by an earthquake and start killing people.
You can now watch The Monster That Challenged the World online on the following streaming providers in the United States.
| Directing | Arnold Laven | Director |
| Writing | David Duncan | Story |
| Production | Arthur Gardner | Producer |
| Writing | Pat Fielder | Screenplay |
| Production | Jules V. Levy | Producer |
| Sound | Heinz Roemheld | Original Music Composer |
| Camera | Lester White | Director of Photography |
| Editing | John Faure | Editor |
| Production | Kerwin Coughlin | Casting |
| Art | James Dowell Vance | Art Direction |
| Art | Rudy Butler | Set Decoration |
| Crew | Augie Lohman | Special Effects |
| Sound | Heinz Roemheld | Music Director |
| Sound | B. F. Remmington | Sound Recordist |
| Sound | Charles Althouse | Sound Mixer |
| Directing | Maurice Vaccarino | Assistant Director |
| Directing | Paul Stader | Other |
| Crew | Ted Haworth | Other |
| Crew | Robert H. Crandall | Other |
| Camera | Scotty Welbourne | Underwater Director of Photography |
| Camera | Paul Eagler | Other |
| Costume & Make-Up | Abe Haberman | Makeup Artist |
| Costume & Make-Up | Olga Collings | Hairstylist |
| Costume & Make-Up | Allen Sloane | Wardrobe Supervisor |
| Crew | Norman Bishop | Technical Supervisor |
| Sound | Heinz Roemheld | Conductor |
| Production | Virginia Mazzuca | Production Assistant |
| Sound | Charles Althouse | Sound Recordist |
| Sound | Joel Moss | Sound Recordist |
