| Boris Karloff | ... | Dr. Karl Mantell | |
| Julissa | ... | Corinne Mantell | |
| Carlos East | ... | Mark | |
| Isela Vega | ... | Helga | |
| Yerye Beirute | ... | Roland | |
| Eva Muller | ... | Sally | |
| Santanón | ... | Dwarf | |
| Pamela Rosas | ... | Stripper | |
| Fuensanta | |||
| rest of cast listed alphabetically: | |||
| Sandra Chávez | ... | Luisa Martinez | |
Directed by | |||
| Jack Hill | (US scenes) | ||
| Juan Ibáñez | (Mexican scenes) | ||
Writing credits(in alphabetical order) | ||
| Jack Hill | writer | |
| Luis Enrique Vergara | writer | |
Produced by | |||
| Luis Enrique Vergara | .... | producer | |
Original Music by | |||
| Enrico C. Cabiati | |||
Cinematography by | |||
| Raúl Domínguez | |||
| Austin McKinney | |||
Film Editing by | |||
| Felipe Marino | |||
Art Direction by | |||
| José Méndez | |||
| Octavio Ocampo | |||
Set Decoration by | |||
| Raúl Cárdenas | |||
Costume Design by | |||
| Vicente Tostado | |||
Makeup Department | |||
| Tony Ramirez | .... | makeup artist | |
Production Management | |||
| José Luis Cerrada | .... | production manager | |
Second Unit Director or Assistant Director | |||
| José Luis González de León | .... | assistant director | |
Sound Department | |||
| Heinrich Henkel | .... | sound recordist | |
| Víctor Rojo | .... | dialogue recordist | |
Camera and Electrical Department | |||
| Eduardo Rojo | .... | camera operator | |
Other crew | |||
| Guillermo Olivera | .... | production coordinator | |
| Stim Segar | .... | dialogue director | |
| James M. Tanenbaum | .... | computer technical advisor (uncredited) | |
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| Flying Disc Man from Mars | The Brothers Grimm | The Island of Dr. Moreau | The Holy Mountain | Chandu the Magician |
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| Full cast and crew | Company credits | External reviews |
| News articles | IMDb Fantasy section | IMDb Mexico section |
With its rep as one of Karloff's worst, I expected something drab and stilted (like CAULDRON OF BLOOD, '67) so was surprised to find this quite colorful, albeit in a tacky way. While it lacks subtlety (and often coherence), the film delivers sufficient sleaze to please prurient drive-in dwellers.
The haphazard script provides much to mock. Spellunking scientists discover and attempt to communicate with a tentacled, "intelligent" rock. That's all of the plot you need...it's raw gibberish. Amoral researchers stop just short of human sacrifice in their experiments, and place blind faith in primitive, printout-spitting computers. Rants from Roland, the diamond-obsessed comic relief, beg for MST3K skewering, and Karloff's scientific theories are the daffiest heard since mad docs roamed the Monogram lot.
Most commenters cluck about "Poor Boris." Granted, he isn't tossed one morsel of decent dialogue, but he just phones his part in. (The young leads, on the other hand, are quite likable, even though their characters are not.) Upon his passing, rummagers of Karloff's effects discovered that his check for this flick was uncashed...perhaps he expected it to bounce.