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.
Upon arriving at the dilapidated estate of his mentor, Dr. Harker finds his former professor, Dr. Usher, radically changed. Instead of the reasoned scholar he once knew, a paranoid man is in his place and he's spiraling into madness.
In foggy London Dr Jekyll experiments on newly deceased women determined to discover an elixir for immortal life. Success enables his spectacular transformation into the beautiful but psychotic Sister Hyde who stalks the dark alleys of Whitechapel for young, innocent, female victims, ensuring continuation of the bloodstained research. With each transformation Sister Hyde becomes the more dominant personality, determined to eventually suppress the frail, ineffectual Dr Jekyll forever.
A mad scientist (Donald Pleasence) crosses plants with people, and the results wind up in a sideshow.
A renegade federal agent uses a new drug to create an army of unbeatable warriors.
A story about a scientist who is obsessed with communicating with the dead.
As novice detectives, Bud and Lou come face to face with the Invisible Man.
"Libidine" is quite peculiar erotic horror about a scientist, who performs some kind of experiment on his snake. His adolescent daughter Anna has an erotic relationship with the snake.
A fugitive doctor tries to raise the dead for South Sea Islanders.
Dr. Eric Vornoff, with the help of his mute assistant Lobo, captures twelve men for a grisly experiment; His goal to turn them into supermen using atomic energy. Reporter Janet Lawton, fiancée of the local lieutenant, vows to investigate Vornoff's supposedly haunted house.
Dr. Laurence, a once-respectable scientist, begins to research the origin of the mind and the soul. The science community rejects him, and he risks losing everything for which he has worked. He begins to use his discoveries to save his research and further his own causes, thereby becoming... a Mad Scientist, almost unstoppable...
The discovery of a perfectly preserved caveman prompts a mad scientist to attempt a daring brain transplant.
A scientist develops a formula which will cause animals to regress to the form of their primitive ancestors, and tries it on himself with disastrous results.
After a doctor kills his mistress and himself while researching the mysterious previous owner of his Boston home, his colleague, Dr. Norman Boyle, takes over his studies and moves his family into the Boston mansion. Soon after, Boyle's young son Bob becomes plagued by visions of a young girl, who warns him of the danger within the house.
Former Countess Clair and Professor Gruber conduct occult research in castle basement of Count Victor, re-animating people to kill for them.
The son of the infamous Dr. Orloff clashes with his father when he begins to stalk and dismember prostitutes to get parts to reanimate his dead mother.
When Dr Frankenstein decides to retire from the monster-making business, he calls an international roster of monsters to a creepy convention to elect his successor. Everyone is there including Dracula, The Werewolf, The Creature, Dr Jekyll & Mr Hyde and many more. But Frankenstein's title is not all that is at stake. The famous doctor has also discovered the secret of total destruction that must not fall into the wrong hands!
Dr. Bernard Adrian is a kindly scientist who seeks to cure a young woman's polio. He needs human spinal fluid to complete the formula for his experimental serum. Meanwhile, a vicious circus ape has broken out of its cage, and is terrorizing the townspeople. Can there be a connection?
A scientist is turned into an ape man.
The son of the inventor of a matter-transporter, which turned him into a monster when he tried to transport himself along with a tiny housefly, continues to pursue his father's experiment, while his own two sons attempt to extricate him, themselves and the family name from further disaster and scandal.