Overview
Uninvited is a 1987 American science-fiction horror film written, produced and directed by Greydon Clark and starring George Kennedy, Alex Cord, Clu Gulager, Toni Hudson and Eric Larson. The film primarily takes place aboard a luxury yacht owned by a criminal multimillionaire and bound for the Cayman Islands, whose passengers and crew are terrorized by a mutant cat.
Plot
At a genetic research facility, a genetically altered mutant cat is placed inside a house cat. The house cat escapes captivity, and kills several people in the building before escaping through an air duct. The next day, it jumps on a truck driven by two men, and kills them both by attacking them, causing them to crash the car. Meanwhile, multimillionaire "Wall Street" Walter Graham, and his associate Mike Harvey are preparing to take a luxury yacht to the Cayman Islands to evade criminal prosecution. Accompanying them are Rachel, the boat's captain who is working her way to buy the boat back from Walter; Albert, Walter's friend; and Suzanne and Bobbi, two spring breakers invited to come along.
Before the trip starts, Suzanne and Bobbi meet three boys, Martin, Corey, and Lance at the marina, and invite them to come along. Walter reluctantly agrees, but only under the condition that they work as the boat's crew as the other crew had previously quit. The cat finds its way to Suzanne, who also brings it along, only after Walter playfully and rather ironically protests that the cat is not invited. After the ship sets sail, the passengers have a party, although a drunken Albert is killed alone on the deck by the cat, and falls into the water. The others find some of Albert's blood the next day and dismiss his death as accidental. Martin, ever the inquisitive and enterprising biologist, nevertheless inspects the blood sample using a sextant in lieu of a microscope and observes that Albert's blood cell count was abnormally high.
Walter later attempts to rape Bobbi and Lance tries to stop him, but Mike intervenes and shoots Lance in the shoulder before the cat—incensed by the frenzy of violence—bites into his Achilles tendon. Mike is critically wounded by the bite, and Martin deduces that the cat's bites are venomous. Rachel and Suzanne attempt to call for help, although Walter destroys any means of communication, intent on reaching the Cayman Islands. Mike soon begins having horrible spasms, and eventually dies; the survivors throw his body overboard.
From Wikipedia (CC BY-SA 4.0).