This is one of four Mexican genre films featuring Boris Karloff, whose scenes were all shot in Los Angeles (just before his death), with the footage later incorporated into films made in Mexico. Here he plays a scientist who is stricken with a rare disease after experimenting with a
"living rock" taken from a volcano. While he rests in bed, his assistants--evil Isela Vega (more famous as Warren Oates' girlfriend in Sam Peckinpah's mesmerizing BRING ME THE HEAD OF ALFREDO GARCIA), a dwarf, a hunchback, and an Arab--continue his work, waylaying strippers and feeding their blood
to the rock. Karloff is only in the film for the first 15 minutes and then again, briefly,...