A group of scientists travel to a remote island to study the effects of nuclear weapons tests, only to get stranded when their airplane mysteriously explodes. The team soon discovers that the tests have given rise to crabs mutated into intelligent, impervious, telepathic giants intent on increasing their numbers by breeding, then travelling to populated areas to feed, and which do not intend to be stopped by their discoverers.

While on a fishing trip, Harry Baldwin and his family hear an explosion and realize that Los Angeles has been leveled by a nuclear attack. Looters and killers are everywhere. Escaping to the hills with his family, he sets about the business of surviving in a world where, he knows, the old ideals of humanity will be the first casualties.

Two psychics place a prostitute under hypnosis in order to learn about her past-life experiences. When they unwittingly send her back in time, she finds herself in the Middle Ages, suspected of being a witch and on the verge of being executed.

A supermodel gets murdered. While investigating the case the story of a waitress turned glamor girl is revealed.

After being released from prison, ex-gunfighter John Wesley Hardin hopes to have his autobiography published in order to rehabilitate his tarnished reputation.

An expedition to the lunar ice caves contracts a deadly moon-fungus. Stopping en route they contaminate a space station with the fungus, which soon begins to take over the entire place.

Brett Wade, gambler, gunslinger, and classical pianist, is wounded in a gunfight with the Ferris clan; the doctor finds signs of tuberculosis. En route to Colorado for his health, Brett stops in Socorro, New Mexico along with Ferris gunfighter Jimmy Rapp. Sheriff Couthen fears another shootout, but what Brett has in mind is saving waif-with-a-past Rannah Hayes from a life as one of Dick Braden's saloon girls.

Detective Mike Hammer's investigation of a murder puts him in the middle between warring jewel thieves.

Major Jim Colton is a sympathetic leader who has a working relationship with Apache leader Cochise. Colton is undermined by corrupt and politically ambitious Indian agent Neil Baylor who sets up a false attack, and the abduction of a local farmer's son. While Colton is away investigating the matter, Baylor convinces Lieutenant Bascom that Cochise's band is to blame, and incites him to lead an expedition against the Apache band to return the boy.

The escape of Bubber Reeves from prison affects the inhabitants of a small Southern town.