A marine biologist, a dolphin trainer, a research scientist, and a local sheriff try to hunt down a large sea monster, a shark/octopus hybrid, that is devouring swimmers and fishermen off a south Florida coast.
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A prehistoric shark (named in the books "megalodon") lurks Mallorca, killing a couple of individuals. A professional diver begins the hunt.
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.
A girl enters a rite of sexual passages after a series of rituals performed by a group of students, the ritual marks a stripping of innocence, as the girl engages with an octopus.
A young woman inherits an old hotel in Louisiana where, following a series of supernatural "accidents", she learns that the building was built over one of the entrances to Hell.
A group of Satanic hippies wreak havoc on a small town where a young boy, whose sister and grandfather were victimized by them, tries to get even - with deadly results.
A scientific expedition to Loch Ness runs into trouble when the group leader is killed in a mysterious diving accident. Soon after, when the unorthodox Professor Howell shows up to take over as leader of the group, more strange incidents and attacks start to occur. While Howell and TV producer Elizabeth Borden are busy investigating the source of the attacks, the body of an enormous sea creature washes up on the lake's shore.
