The planets' unusual alignment in the solar system causes ants in New Mexico desert to gather collective intelligence and advance their territories, killing off all the other animals around them. From a shiny, teched-out bio-dome, Dr. Hubbs (Nigel Davenport, sort of workingman's James Mason) and his reluctant, number inclined assistant James (Michael Murphy) are trying to gather information on these super ants. Hubbs is a determined man and he will stop at nothing, even if it means sacrificing other humans around him. And soon they find that they are no match for these pesky creatures.
After being (accidentally) orphaned, a young, horse-riding, luminous country girl (Lynne Frederick) from the nearby ranch, also becomes marooned inside the dome and under attack.
Phase IV is a fascinating film. It's like Jaws but instead of one shark, you got thousands of ants trying to outsmart you. With effective extreme closeups and unexpectedly gorgeous visuals and the 70s pseudo science wtf-ness, it is a thoroughly enjoyable film.
