Basically, about how aliens get stuck on earth. They end up being held in a facility and studied by an organization called MNU. Basically, we just want to learn and study them and keep them under control, while trying to figure out how their technology works.
Then, it gets into this pretty good story about a specific guy that deals with the aliens...i don't want to give too much away, but it's a good story and very imaginative, imo.
Saw it with my 15yr old sister. She liked it. Some people walked out in the beginning. It was dope as hell though.