Just because your movie is about the aftermath of an alien invasion doesn’t mean you ignore the alien invasion. In fact, Captive State co-writer and director Rupert Wyatt has a very, very clear idea of how the off-screen alien invasion before the events of his film went down. It mirrors how he believes an invasion…
Source: io9 – Captive State’s Backstory Was Fueled by More Great Sci-Fi Ideas Than the Film Could Contain