In the film a UFO appears above Johannesburg, and stays there. There are 1.8million aliens on board, and they decide to put the aliens in a squatter camp nearby. As they breed and grow, they need a bigger camp. They go in to try and move them. One of the movers gets infected, and starts to turn into an alien. The film the follow what happens to the guy next.
I'm not sure what to think of the film. I thought it was a clever statement about "squatter camp" culture in South Africa. Some of the "teenage boy" element seemed to enjoy the guns and explosions in the film. I don't think I've ever heard that element cheer in cinemas before, yet they were in this film. I'm not saying that's a bad thing, it's just I wonder what they got out of the film.
Incidentally, the film is set in South Africa. South Africans have a fairly strong accent. Some Americans tell me I have a strong accent. I'm not entirely sure, therefore, what they'll think of the accents in this film.