牛仔詹姆斯·弗朗西斯通过捕捉霸王龙生活在紫禁城谷，并把它在墨西哥马戏团寻求名利。他的受害者，被称为Gwangi，结果有反感在公开被显示。另一部电影特色的雷·哈利豪森的停止动作特效人才。

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

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.

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.