London workers unearth a cluster of prehistoric bones, which leads to further discovery of a strange missile, locust, and demon-like creatures.

The abominable snowman plot: Botanist Dr. John Rollason joins the exploration team of crass American showman Tom Friend on a dangerous expedition into the Himalayas to search for the legendary Yeti. While setting up camp, the group is attacked by a large beast, which is shot by trapper Ed Shelley and later stored in a cave to attract a live specimen. Not only do these giant beings exist, they might be capable of invading the thoughts of human beings. Shatter...