After a small town in Maine is consumed by a thick mysterious fog from which creatures emerge to attack the townsfolk, a group of survivors hole up in a local grocery store.

As children, Kathy, Ruth, and Tommy spend their childhood at an idyllic and secluded English boarding school. As they grow into adults, they must come to terms with the complexity and strength of their love for one another while also preparing for the haunting reality awaiting them.

A Florida real estate developer and her captain lure investors to a property in the Everglades called Dreamland Shores, under false pretenses that the swampland will soon be developed. After the group arrives on a small island, they find it has been overrun by giant mutated ants, brought on by the dumping of toxic waste in the area.

A man, his business partner, and his wife are enlisted to transport an unknown object from a Russian military base, only to discover that the object is a giant, genetically-altered python.

In the distant future, a federation marshal arrives at a research lab on a remote planet where a genetic experiment has gotten loose and begins feeding on the dwindling scientific group.

A social misfit, Willard is made fun of by his co-workers, and squeezed out of the company started by his deceased father by his boss. His only friends are a couple of rats he raised at home, Ben and Socrates. However, when one of them is killed at work, he goes on a rampage using his rats to attack those who have been tormenting him.

In an effort to find an economic means of purifying salt water, a joint U.S.-Japanese military command is set up on an isolated Japanese island where an unusual salt water lake is situated. However, their purifying experiments arouse the prehistoric monster Obaki from hibernation at the lake's bottom, and it proceeds to attack Japan. Although made by a U.S. independent film company, this film was based on a Japanese Toho monster film of 1958, "Daikaiju Varan", from which all of the monster effects scenes and a few incidental dramatic shots were edited into it.

A United Nations investigator crosses paths with a pair of psychic sisters on his way to Trollenberg observatory in the Swiss Alps, which has been plagued by a series of mountaineer disappearances that may be related to a radioactive cloud at the mountain's south face.

The inhabitants of Ganymede need to find mates from another world or they will become extinct. They soon discover a suitable breeding stock amongst the females of planet Earth.