A strange animal attack turns a botanist into a bloodthirsty monster.
When scientists exploring the Amazon River stumble on a “missing link” connecting humans and fish, they plan to capture it for later study. But the Creature has plans of his own, and has set his sights on the lead scientist's beautiful fiancée, Kay.
In a tributary of the Amazon, a monster – half-man, half-fish – is captured and placed in a reservoir in a Florida national park to be observed by scientists.
In 1960, four American scientists travel to a planet that has just entered Earth's solar system to see if it's able to support an Earth colony. They find an oxygen atmosphere, a lush earth-like forest, and earth-like animals living around a potable fresh-water lake.
Scientists surgically transform the Creature into an air-breather, but being able to live on land is not enough to make him comfortable with humans. Enraged, he turns his wrath on anyone who comes near as he desperately tries to return to the deep-water world where he truly belongs.
An alien from Venus tries to take over the world with the help of a disillusioned human scientist, as his wife, his best friend and the friend's wife try to intervene.
A mysterious hypnotist reverts his beautiful assistant back into the form of a prehistoric sea monster that she was in a past life.
A party of archaeologists discovers the remnants of a mutant five millennia-old Sumerian civilization living beneath a glacier atop a mountain in Mesopatamia.
Deep in the jungles a mad scientist is using the natives' voodoo for his experiments to create an indestructible being to serve his will. When a party of gold seekers stumbles upon his village, the scientist realizes that Marilyn the expedition's evil leader is the perfect subject for his work.
Baron Victor Frankenstein has discovered life's secret and unleashed a blood-curdling chain of events resulting from his creation: a cursed creature with a horrid face — and a tendency to kill.
A huge, alien structure resembling an inverted cone, appears in the woods outside a small rural town. Sent from Washington to investigate the origin of the mysterious object, a team of investigators discovers that intelligent parasites from inside the "cone" can attach themselves to humans' nervous systems and control their minds, taking control of the authorities and workers, making communication with the outside world impossible, and leaving the responsibility of stopping the invasion up to seven people who have thus far been able to avoid possession by these creatures from parts unknown.
A pathologist experiments with a deaf-mute woman who is unable to scream to prove that humans die of fright due to an organism he names The Tingler that lives within each person on the spinal cord and is suppressed only when people scream when scared.
Once hounded from his castle by outraged villagers for creating a monstrous living being, Baron Frankenstein returns to Karlstaad. High in the mountains they stumble on the body of the creature, perfectly preserved in the ice. He is brought back to life with the help of the hypnotist Zoltan who now controls the creature. Can Frankenstein break Zoltan's hypnotic spell that incites the monster to commit these horrific murders or will Zoltan induce the creature to destroy its creator?
A newlywed sheriff tries to stop a shambling monster that has emerged from a spaceship to eat people.
A small island community is overrun with creeping, blobbish, tentacled monsters which liquefy and digest the bones from living creatures. The community struggles to fight back.
A mad stage hypnotist Dr. John Basso reverts his beautiful assistant Doreena into the physical form of a prehistoric sea monster she was in a past life. Using this power he attempts to find fame and fortune by predicting a series of murders and then using the monster to carry them out.
A farmer traps three people in a cave with his pet prehistoric monster.
Young Victor Frankenstein returns from medical school with a depraved taste for beautiful women and fiendish experiments.
A scientific team in Mexico discover a pool of unusual baby "octopus-like" specimens. Gathering a few for analysis back at the lab, it is soon discovered that the critters belong to a gangly six-foot half man/half octopus-like creature, that's pretty angry and wants her 'babies' returned…
Mysterious and unearthly deaths start to occur while Professor Saxton is transporting the frozen remains of a primitive humanoid creature he found in Manchuria back to Europe.