A US government germ warfare lab has had an accident. The first theory is that one of the germs has been released and killed several scientists. The big fear is that a more virulent strain, named The Satan Bug because all life can be killed off by it should it escape, may have been stolen.
George Maharis
as Lee Barrett
Richard Basehart
as Dr. Gregor Hoffman
Anne Francis
as Ann Williams
Dana Andrews
as Gen. Williams
John Larkin
as Dr. Leonard Michaelson
Richard Bull
as Eric Cavanaugh
Frank Sutton
as Henchman Donald
Ed Asner
as Henchman Veretti
Simon Oakland
as Tasserly
John Anderson
as Agent Reagan
John Clarke
as Guard Lt. Raskin
Hari Rhodes
as Guard Lt. Johnson
