This is the kind of stuff I grew up on as a kid, watching science fiction and horror movies on TV which had been originally released in the 1940s and 50s. The 1950s was a golden age of science fiction movies, and THEM! was one of the very best. Good casting, dialog, and storyline, and commendable special effects for the time. Although the "atomic-radiation-causing-terrible-mutations" was a standard device in 50s sci fi (THE DEADLY MANTIS, IT CAME FROM BENEATH THE SEA, and others), it was a workable one, and given that the ants were from the same area of desert where the first atomic blast occurred, it had just enough plausibility. I also like the little touches of humor and banter between characters. There was even a little bit of cheesecake when the young Dr. Medford (Joan Weldon) gets her skirt caught when descended from the plane, revealing a pair of shapely legs. This is one I keep going back to on rainy Saturday afternoons! A gem of its kind.