"By far the best of the '50s cycle of 'creature features', Them! and its story of a nest of giant radioactive ants (the result of an atomic test in the New Mexico desert) retains a good part of its power today. All the prime ingredients of the total mobilisation movie are here: massed darkened troops move through the eerie storm drains of Los Angeles, biblical prophecy is intermixed with gloomy speculation about the effect of radioactivity. Almost semi-documentary in approach, the formula is handled with more subtlety than usual, and the special effects are frequently superb." - Time Out