Geoff, a man with an unusual compulsion to eat inedible objects, calls on the unorthodox services of backstreet practitioner Doctor Dora in order to cure his ailment.
University professor George Kingsley is struck by gangsters while crossing the street, leaving him with brain damage and one of the gangsters, Cannon, paralyzed. Kingsley's friend Dr. Sovac attends to both men, and when Cannon offers him a reward for aiding his recovery, Kovac transplants part of Cannon's brain into the dying Kingsley's skull, creating a dual personality.
An ex-vaudeville actor is working as the assistant to a doctor who has Frankenstein aspirations. The ex-vaudeville actor kills the doctor and decides to assume the identity of the dead physician.
Three terrifying tales follow a young groom in Baguio for his honeymoon is possessed by a homicidal spirit when he discovers a cursed ring and decides to wear it; in the eerie halls of a mysterious hospital, a doctor practices voodoo and dead bodies wander in the night; and a student who learns, while a guest at a town fiesta in a remote province, that the locals' hospitable ways leave her clueless about a mysterious nightly ritual.
A brilliant but deranged neurosurgeon becomes obsessively fixated on a judge's daughter. With the help of an escaped criminal whose face he has surgically deformed, the mad man lures her, her father, and her fiancé to his isolated, castle-like home.
After a team of surgeons botches his beloved wife's operation, the distraught Dr. Phibes unleashes a score of Old-Testament atrocities on his enemies.
After a pawn shop robbery goes askew, two criminals take refuge at a remote farmhouse to try to let the heat die down, but find something much more menacing.
Now confined to a mental hospital, young Kirsty insists her supposedly dead father is actually stuck in Hell following his wife’s betrayal. Few believe the young woman’s lurid stories aside from the thrill-seeking Dr. Channard. Kirsty is undeterred and, with the help of a fellow patient, heads to Hell for a rescue.
Having escaped from the psychiatric prison, Dr. Albert Beck hides out in an empty house until its new owners unexpectedly arrive to move in! Forced into the attic to evade the recently widowed mother, Beck watches from above... undeniably attracted to her 18-year-old daughter.
The doctor is back! And this time, she’s cloned herself to make an army of unstoppable warriors!
Dr. Bonner plans to live forever through periodic gland transplants from younger, healthier human victims. Bonner looks about 40; he's really 104 years old. But people are starting to get suspicious, and he may not make 200.
An unlucky woman’s mother is murdered by a scarf-wielding killer named Silk, leaving the woman injured, traumatised and suffering from amnesia. She’s committed to a mental institution, where Silk follows her, looking for the papers he was trying to get from her mother. And Silk’s only the beginning of her problems, since the asylum is run by a mad doctor, performing experiments in chemical lobotomies!
In late 19th century London, a woman weds a necrophiliac doctor whose first wife died under mysterious circumstances - and who might be returning from the grave to torment her successor.
Dr. Hohner, theatre physician at the Vienna Royal Theatre, murders his mistress, the star soprano when his jealousy drives him to the point of mad obsession. Ten years later, another young singer reminds Hohner of the late diva and his old mania kicks in. Hohner wants to prevent her from singing for anyone but him, even if it means silencing her forever.
A surgeon transplants the heart of an ape into his ailing son with horrific results.
A mad doctor uses patients at his isolated psychiatric institute as subjects in his attempts to create longevity by surgically installing an artificial gland in their skulls.
A mad scientist creates man eating creatures from carnivorous plants.
A depraved scientist falls madly in love with a young woman and turns her lover into a hideous monster for meddling in his diabolical plans.
Dr. Leon Kravaal develops a potential cure for cancer, which involves freezing the patient. But an experiment goes awry when authorities believe Kravaal has killed a patient. Kravaal freezes the officials, along with himself. Years later, they are discovered and revived in hopes that Kravaal can indeed complete his cure. But human greed and weakness compound to disrupt the project.
Chaney plays two roles: mad scientist Arthur Lamb and Lamb's "experiment", known only as the Ape Man. This hideous creature was the result of Lamb's attempts to transplant animal glands into human beings. A lost film.