The Revenge of Dr. X

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.

After Malukan immigrants engage in a string of corpse mutilations at various New York City hospitals, a doctor and a morgue assistant travel to the Maluku Islands to investigate.

Confined to a mental hospital, young Kirsty Cotton insists her supposedly dead father is stuck in hell, controlled by sadomasochistic demons after being betrayed by his evil, occult-obsessed wife, Julia. Few believe Kirsty, except the thrill-seeking Dr. Channard, who is intrigued by the young woman's lurid stories. So when Kirsty and fellow patient Tiffany head to hell for a rescue, Channard and Julia are close behind.

Seymour Krelborn is a nerdy orphan working at Mushnik's; a flower shop in urban Skid Row. He harbors a crush on fellow co-worker, Audrey Fulquard, and is berated by Mr. Mushnik daily. One day, Seymour finds a very mysterious unidentified plant which he calls Audrey II. The plant seems to have a craving for blood and soon begins to sing for his supper.

At the beach, a pumpkin washes ashore and is promptly and cruelly destroyed by two young women frolicking on the sand. When they crush the pumpkin, their legs become covered in an inexplicable red liquid. Fast forward to mischief night when these same two women and their friends find themselves being stalked by a killer Pumpkinman. Is he just a sicko in a costume or something more bizarre that has marked them for death?

Professor Frankenstein creates a teenager from an accident victim, who gets angry when he learns he is going to be taken apart.

A mad scientist creates a monster called "Mosaico," who breaks out of the laboratory to hunt down and kill beautiful women.

An obsessed scientist conducts profane experiments in evolution, eventually establishing himself as the self-styled demigod to a race of mutated, half-human abominations.

Tampering with life and death, Henry Frankenstein pieces together salvaged body parts to bring a human monster to life; the mad scientist's dreams are shattered by his creation's violent rage as the monster awakens to a world in which he is unwelcome.

A mad doctor (Bela Lugosi) and his helpers (John Carradine, George Zucco) lure girls to his lab for brain work, to help his wife.

A fugitive, dangerous madman reaches an English village where he confronts his former partner who left him for dead in the jungle after their discovery of a diamond mine. When the former partner also claims to have since lost the mine and all its wealth, which he took all for himself, and though the partmer is still living in a state of luxury , the madman takes up an offer from a crazed scientist to make him invisible, something the scientist has already done with experimental animals, so that he can take revenge.

In 19th century England, a noted brain surgeon rescues a former student from being hanged on a false conviction for murder, and spirits him away to an ancient, repurposed abbey far in the countryside. There, he connives his pupil into assisting him in mapping the functions of the various parts of the human brain, using living subjects who are under a terrible animation-suspending drug called "black sleep". Subsequently, the student, along with the daughter of one of the subjects, discover that most of these subjects have survived but are being kept in a dungeon-like cellar, in various stages of physical and mental derangement...

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.

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.

Dr. Bill Cortner and his fiancée, Jan Compton, are driving to his lab when they get into a horrible car accident. Compton is decapitated. But Cortner is not fazed by this seemingly insurmountable hurdle. His expertise is in transplants, and he is excited to perform the first head transplant. Keeping Compton's head alive in his lab, Cortner plans the groundbreaking yet unorthodox surgery. First, however, he needs a body.

Following his forced retirement from an appalling rock band, Jason decides to vacation at Brittlehouse Manor, a health farm run by the leather-gloved, ex-Nazi scientist Dr. Storm. Along the way, Jason meets Judy, also on her way to Brittlehouse Manor to visit her aunt, who married Dr. Storm some years ago. Once they arrive, the pair realise rather quickly that something is wrong, probably because the other guests have had their brains surgically removed, or all the blood pouring from the sink, or possibly just because the creepy midget keeps telling them to brush their teeth.

A scientist working on cures for rare afflictions, such as a bone softening agent made from molds to allow him to correct the spinal deformity of his nurse, finds the physical causes of lycanthropy in wolf-man Larry Talbot and of vampirism in Count Dracula, but himself becomes afflicted with homicidal madness while exchanging blood with Dracula.

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.

Seymour works in a skid row florist shop and is in love with his beautiful co-worker, Audrey. He creates a new plant that not only talks but cannot survive without human flesh and blood.

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.