While holidaying in Ireland, a pregnant children's author finds her mental state becoming increasingly unstable, resulting in paranoia, hallucinations, and visions of a doppelgänger.
A director and a screenwriter write a screenplay together about a globally spreading epidemic. Unbeknownst to them, an outbreak develops around them in the real world.
After undergoing radical surgery for injuries from a motorcycle accident, a young woman develops a strange phallic growth on her body and a thirst for human blood—the only nourishment that will now sustain her.
Citizens of a small town are infected by a biological weapon that causes its victims to become violently insane. As uninfected citizens struggle to survive, the military readies its own response.
Wealthy slacker college student Mark, his new girlfriend Sarah, and their friends are invited to a special showing at a mysterious wax museum which displays 18 of the most evil men of all time. After his ex-girlfriend and another friend disappear, Mark becomes suspicious.
In 1965 Mexico City, Flavia, a wealthy yet lonely schoolgirl, befriends Veronica, a young orphan girl who has a fascination with witchcraft. Veronica convinces Flavia that she is a real witch and forces her to be her assistant. The children's games gradually become more serious and Veronica demands more from Flavia.
A prudish married couple feel put upon by the swingers living in their apartment building. One night, by accident, they discover a way to both rid themselves of the “perverts” down the hall and simultaneously realize their dream of opening a restaurant.
As a lone spaceship proceeds on its long voyage across space, the crew are surprised to encounter a strange pyramid form. Surprise turns to horror as one by one, they discover that their darkest nightmares are all starting to become real. The pyramid has to be behind it all somehow, but how can they save themselves from its influence?
An American family moves to Mexico to fabricate dolls, but their toy factory happens to be next to a Sanzian grave and the toys come into possession of an old, malicious spirit.
While dabbling in Satanism, Count Karstein resurrects Mircalla Karnstein who initiates him into vampirism. As a rash of deaths afflicts the village, Gustav the head of Puritan group leads his men to seek out and destroy the pestilence. One of his twin nieces has become inflicted with the witchcraft but Gustav's zeal and venom has trapped the innocent Maria, threatening her with a tortuous execution, whilst Frieda remains free to continue her orgy of evil.
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.
A horror movie star returns to his famous role after years in a mental institution. But the character seems to be committing murders independent of his will.
A posh couple experience car trouble on their way to a villa party and stop into a local mechanic's shop for assistance, unaware of his shady background. After he and his mentally challenged assistant fix the car, the couple invite them to the party to return the favor, leading to an evening of mayhem.
A young woman seeks vengeance and finds love when her parents are killed in the Amazon and she is taken prisoner by an indigenous tribe of headhunters.
Ghoulies II picks up a short time after the first movie, a few of the little nasties stow away on an amusement park ride and bring big bucks to a dying fair. The creatures are mad after an attempt to kill them, so the creatures go on a rampage through the fairgrounds, ultimately leading to an explosive conclusion!
People are dying mysteriously and gruesomely, and nobody has a clue what the cause is. Only health worker Mike Brady has a possible solution, but his theory of killer slugs is laughed at by the authorities. Only when the body count begins to rise and a slug expert from England begins snooping around does it begin to look like Mike had the right idea after all.