| Complete credited cast: | |||
| James Whitmore | ... | Sgt. Ben Peterson | |
| Edmund Gwenn | ... | Dr. Harold Medford | |
| Joan Weldon | ... | Dr. Patricia Medford | |
| James Arness | ... | Robert Graham | |
| Onslow Stevens | ... | Brig. Gen. Robert O'Brien | |
| Sean McClory | ... | Maj. Kibbee | |
| Christian Drake | ... | Trooper Ed Blackburn (as Chris Drake) | |
| Sandy Descher | ... | The Ellinson Girl | |
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Mary Alan Hokanson | ... | Mrs. Lodge (as Mary Ann Hokanson) |
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Don Shelton | ... | Trooper Capt. Fred Edwards |
| Fess Parker | ... | Alan Crotty | |
| Olin Howland | ... | Jensen (as Olin Howlin) | |
In the New Mexico desert, Police Sgt. Ben Peterson and his partner find a child wandering in the desert and sooner they discover that giant ants are attacking the locals. FBI agent Robert Graham teams up with Ben and with the support of Dr. Harold Medford and his daughter Dr. Patricia 'Pat' Medford, they destroy the colony of ants in the middle of the desert. Dr. Harold Medford explains that the atomic testing in 1945 developed the dangerous mutant ants. But they also discover that two queen ants have flown away to Los Angeles and they are starting a huge colony in the underground of the city. When a mother reports that her two children are missing, the team and the army have a lead to follow. Will they arrive in time to save the children and destroy the colony? Written by Claudio Carvalho, Rio de Janeiro, Brazil
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.