A strange sphere settles down in a California canyon, causing both the scientific and military communities to gather around to investigate.

A teenage couple making out in the woods accidentally runs over an alien creature with their car. The creature's hand falls off, but it comes alive, and, with an eye growing out of it, begins to stalk the teens. Meanwhile, Joe the town drunk wants to store the body in his refrigerator, but some of the alien's buddies inject alcohol into his system, and Joe dies of an overdose.

Lt. Col. Glenn Manning is inadvertently exposed to a plutonium bomb blast and although he sustains burns over 90% of his body, he survives. Then he begins to grow, but as he grows he starts losing his mind. By the time he stops he is 50 ft tall, insane and is on the rampage.

An over-the-hill heavyweight boxing champion who suffers from the ravages of years of head trauma is exploited by his manager, despite the efforts of a compassionate young woman who tries to help him recover his self-respect.

Johnny Broderick, arson squad investigator, and his assistant, Ben Howard,, investigate a warehouse fire and find evidence of arson. Lawyer William Yarbo is behind the series of incendiary fires that have been plaguing the city. Keely Hariss, an actress, inherited the warehouse from her father. Yabro calls on her and says that he and her father had heavily insured the building and planned to burn it and collect, and also tells her she must accept half of the insurance money or he will see that she is blamed for the arson. "Pop" Bergen, the father of Marily Bergen, is the torch man hired by Yarbo, and he perishes in one of the conflagrations. Yarbo learns that Keely is cooperating with Broderick and he enters the movie studio where she is working, determined to kill her. Written By Les Adams