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
Mary Alan Hokanson
as Mrs. Lodge
Olin Howland
as Jensen
