United States / Aug 12, 1957 / Distributed by 20th Century Fox Film Corp.
They dared enter the Cave of Death to explore the secrets of hell!
1h 16min
Overall average
5.0/10
Trailer

Videos
Plot
A woman leads an expedition into a remote jungle to find her long-lost brother, but instead finds a mad scientist who has created a fungus monster that feeds on the local inhabitants.
Main cast
Full cast
| Actor | Role |
|---|---|
| Martín Garralaga | Lead Villager |
| Patrick O'Moore | Dr. Willoughby |
| William Hamel | Mr. Trainor |
| Charles Grey | Jim Wheatley / ?The Monster Man |
| Charles Postal | Higgs (butler) |
| Sir Lancelot | Sir Lancelot |
| Charles Cirillo | Native (uncredited) |
| Jim Whitecloud | Native (uncredited) |
| Foster Hood | Native (uncredited) |
Genres
Horror
Technical details
| Detail | Value |
|---|---|
| Original title | The Unknown Terror |
| Original language | English (EN) |
| Spoken languages | English |
| Production countries | United States of America |
| Status | Released |
| Production companies | Emirau Productions, Regal Films |
| Release date | 12 agosto 1957 |
| Production | Robert Stabler |
| Writer | Kenneth Higgins |
| Editing | Michael Luciano, Fred W. Berger |
| Cinematography | Joseph F. Biroc |
| Assistant directors | Nathan Barragar, Charles Marquis Warren |
| Camera operators | Joseph F. Biroc |
| Additional photography | Joseph F. Biroc |
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| Production design | G. W. Bernsten, James W. Sullivan, Mike Gordon |
| Art direction | James W. Sullivan, G. W. Bernsten, Mike Gordon |
| Set decoration | G. W. Bernsten, James W. Sullivan, Mike Gordon |
| Special effects | Louis DeWitt, Jack Rabin |
| Music | Raoul Kraushaar, Hugh McDonald |
| Sound | Raoul Kraushaar, Hugh McDonald |
| Costume design | Pat Whiffing, Vou Lee Giokaris, Robert O'Dell, Glen Alden |
| Makeup | Glen Alden, Pat Whiffing, Vou Lee Giokaris, Robert O'Dell |
| Hairstyling | Pat Whiffing, Vou Lee Giokaris, Robert O'Dell, Glen Alden |
Release dates
Theatrical release
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