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.

• The Mirisch Company
• George Maharis
• Richard Basehart
• Anne Francis
• Dana Andrews
• John Larkin
• Richard Bull
• Frank Sutton
• Ed Asner