The Monster That Challenged the World (1957)

Approved  |   |  Horror, Sci-Fi  |  June 1957 (USA)
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Ratings: 5.8/10 from 1,661 users  
Reviews: 74 user | 38 critic

Giant mollusk monsters attack California.



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Complete credited cast:
Lt. Cmdr. John 'Twill' Twillinger
Gail MacKenzie
Dr. Jess Rogers
Barbara Darrow ...
Jody Simms
Dr. Tad Johns (as Casey Adams)
Harlan Warde ...
Lt. Robert 'Clem' Clemens
Sheriff Josh Peters
Mimi Gibson ...
Sandy MacKenzie
Marjorie Stapp ...
Connie Blake
Jody McCrea ...
Seaman Fred Johnson
Wallace Earl Laven ...
Sally (as Eileen Harley)


An earthquake in the Salton Sea unleashes a horde of prehistoric mollusk monsters. Discovering the creatures, a Naval officer and several scientists attempt to stop the monsters, but they escape into the canal system of the California's Imperial Valley and terrorize the populace. Written by Jeremy Lunt <>

Plot Summary | Plot Synopsis


Instant terror ... Just add water! (2001 DVD Promotional) See more »


Horror | Sci-Fi


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Official Sites:



Release Date:

June 1957 (USA)  »

Also Known As:

The Jagged Edge  »

Filming Locations:


Box Office


$254,000 (estimated)

Company Credits

Production Co:

Show detailed on  »

Technical Specs


Sound Mix:

(Western Electric Recording)

Aspect Ratio:

1.85 : 1
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Did You Know?


The majority of the underwater scenes were shot at Catalina Island off the coast of Los Angeles. The close-ups were later filmed in a tank filled with water and plastic sea-weed. See more »


As the recovery boat approaches the downed parachutist's location early in the movie, the position of one crewman alternates between standing down in the cockpit with his arm wrapped around the radio mast in the center of the boat in close-up to standing above the cockpit on the starboard side of the boat in long shots. See more »


Dr. Jess Rogers: We must remember that these creatures can travel over land, too.
See more »


Edited into Attack of the 50 Foot Monster Mania (1999) See more »

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User Reviews

On the A-list of B pictures
13 November 2001 | by (Los Angeles) – See all my reviews

Of course The Monster That Challenged the World is slowly paced. With a budget of about twenty dollars there's a lot of filler. But what little budget there is, is well used in creating a great animatronic monster.

The story is basic but well-structured and it works. I can watch this one over and over without wanting to throw things at the screen or yell at the characters for doing stupid things. My intelligence is more seriously insulted by modern horror films and their idiot protagonists than it ever is by The Monster That Challenged the World.

Among low-budget sci-fi flicks of the 1950s, The Monster That Challenged the World ranks near the top!

Jan Strnad (aka J. Knight)

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