Here you can watch Them! 123Movies
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.
Genre: Horror, Science Fiction
Director: Gordon Douglas
Actors: Chris Drake, Don Shelton, Edmund Gwenn, Fess Parker, James Arness, James Whitmore, Joan Weldon, Onslow Stevens, Sandy Descher, Sean McClory