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.
Richard Carlson
as Dr. Jeffrey Stewart
King Donovan
as Dr. Dan Forbes
Leo Britt
as Dr. Benton
Jean Byron
as Connie Stewart
Harry Ellerbe
as Dr. Allard
Frank Gerstle
as Col. Willis
John Vosper
as Capt. Dyer
Byron Foulger
as Mr. Simon
Leonard Mudie
as Howard Denker
Kathleen Freeman
as Nelly
William Benedict
as Albert
John Zaremba
as Chief Watson
