The ghosts of three elderly industrialists killed in an airplane crash return to Earth to help reunite a young couple whom they initially brought together.

The Office of Scientific Investigations tracks down the source of increased magnetism and radioactivity in Los Angeles, and discovers that a man-made isotope is consuming available energy from nearby mass every few hours, doubling its size in the process. Although microscopic, it will soon become big enough to destroy Earth; and how to stop it is yet to be determined. The film's Deltatron special effects footage is taken from the 1934 German sci-fi film GOLD.

In the small town of Crownport local attorney Bill Adams is trying to break up the ring of corrupt town officials by running for mayor. The cards seemed stacked against him when he gets help from a visiting hunter who, unknown to Adams and the rest of the town, is actually vacationing supreme court justice John Josephus Grant.

A jazz pianist is haunted by his dead ex-lover's crawling hand and floating head.

Cowboy James Franciscus seeks fame and fortune by capturing a Tyrannosaurus Rex living in the Forbidden Valley and putting it in a Mexican circus. His victim, called the Gwangi, turns out to have an aversion to being shown in public. Another film featuring the stop-action special effects talents of Ray Harryhausen.