Intelligent ants wage war on scientists living in a dome in this sci-fi film. Featuring voiceover narration, ants in extreme close-up, and a score that sounds a little like In-A-Gadda-Da-Vida, um, well, I forgot what I was going to say because I just said the words In-A-Gadda-Da-Vida.
Anyway, the ants do the things that ants normally do, which is run around, lay eggs, devour tarantulas, and build towering monolith-like structures in the desert.
I said monolith, not monorail. Anyway, the ants do what ants normally do, which is build giant crop circles with mysterious messages in them and kill sheep and burrow under their skin.
Then the ants do more stuff that ants normally do like create a tiny raft and float down a stream, kill a horse, build more structures that have sun-reflecting mirrors inside them, learn the complex mechanisms involved in the gas lines of pickup trucks and cause one to explode, learn to disable air conditioning units, communicate with humans via a rudimentary version of the internet, instantly mutate, and understand genetics. You know, ant stuff.
Phase IV contains some pretty remarkable micro-cinematography of ants doing ant things, but unless you're way into seeing ants with their disgustingly distended bellies pooping out eggs, and why would you be, it's fairly boring.