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.

Directed by: Curt Siodmak & Herbert L. Strock
Written by: Curt Siodmak & Ivan Tors
Runtime: 76 minutes
Tagline: Terror swoops through the heart of a city in the dead of night!
Cast:
Richard Carlson Richard Carlson
Dr. Jeffrey Stewart 
King Donovan King Donovan
Dr. Dan Forbes 
Leo Britt Leo Britt
Dr. Benton 
Jean Byron Jean Byron
Connie Stewart 
Harry Ellerbe Harry Ellerbe
Dr. Allard 
Frank Gerstle Frank Gerstle
Col. Willis