84 mins | Science Fiction, Horror | June 1, 1957
84 mins | Science Fiction, Horror | June 1, 1957
| IMDb rating | 5.7 |
| Producers | Gramercy Pictures |
| Original title | The Monster That Challenged the World |
| Directors | Paul Stader, Arnold Laven, Maurice Vaccarino |
| Writers | Pat Fielder, David Duncan |
as Lt. Cmdr. John 'Twill' Twillinger
as Gail MacKenzie
as Sandy MacKenzie
as Dr. Jess Rogers
as Dr. Tad Johns
as Sheriff Josh Peters
as Lt. Robert 'Clem' Clemens
as George Blake (lab assistant)
as Connie Blake
as Sally
as Mrs. Simms
as Jody Simms
as Lewis Clark Dobbs
as Seaman Wyatt (Radioman)
as Seaman Fred Johnson
as Seaman Morty Beatty
as Monster Victim
as Deputy Larry
as Admiral Greenhouse
as Deputy Scotty
as Other Lock Watchman
as Boy with Morty's Cap
as Coroner Nate Brown
as Gatekeeper
as Patterson
as Watchman at Lock 57
as Seaman Howard Sanders
as Davis - Resort Owner
as Captain Masters
as Deputy Brewer
as Clarke