After placing his ailing wife Alice in a care home, elderly academic James Parkin goes to stay at a wintry out-of-season hotel which they used to visit together. But at night he seemingly becomes the victim of a ghostly revenge - but who is the avenger?
The Addams Family goes on a search for their relatives. Gomez and Morticia are horrified to discover that Grandpa and Grandma Addams have a disease that is slowly turning them "normal". The only chance they have of a cure is to find a family member hoping that they know a home remedy.
The U.S. Navy's special group "Blue Water" builds a half-shark, half-octopus for combat. But the sharktopus escapes and terrorizes the beaches of Puerto Vallarta.
Specialists gather in a top-secret facility to investigate a series of strange deaths on beaches along the Atlantic Ocean. One of the team's scientists examines video evidence to uncover a possible parasitic explanation for the fatalities. But when a determined detective sends her the crazed writings of a mysterious homeless man, the scientist slowly learns that the actual threat may be more dangerous -- and far older -- than anyone ever imagined. Can she convince her colleagues of the true danger before an ancient force rises from the sea to bring madness and death to all of humanity?