As a result of nuclear testing, gigantic, ferocious mutant ants appear in the American desert southwest, and a father-daughter team of entomologists join forces with the state police officer who first discovers their existence, an FBI agent and, eventually, the US Army to eradicate the menace, before it spreads across the continent — and the world.

James Whitmore
as Sgt. Ben Peterson

James Arness
as FBI Agent Robert Graham

Joan Weldon
as Dr. Pat Medford

Edmund Gwenn
as Dr. Harold Medford

Onslow Stevens
as Brig. Gen. Robert O'Brien

Sean McClory
as Maj. Kibbee

Sandy Descher
as The Ellinson Girl

Chris Drake
as Trooper Ed Blackburn

Don Shelton
as Trooper Capt. Fred Edwards

Fess Parker
as Alan Crotty
Blackhorse
Great Classic Sci-Fi! This movie came out 7 days after I was born! Because of Nuclear testing. ( Of Course ) Everything happened in the 50's movies because of that, these tiny little creatures become as large as cars and bigger. Ravishing the countryside looking for Sugar, of perhaps a M&M factor...
John Chard
Often imitated, rarely bettered. Weird deaths are occurring in the New Mexico desert, it is revealed to be the work of giant mutated ants born out of the "A Bomb" tests that took place there. Trouble escalates to the big city of Los Angeles when one of the giant queen ants escapes to L.A. and sta...