A sci-fi movie for grown-up people Gareth Edwards' micro-budget guerilla-filmed masterpiece is NOT for those expecting a brainless gung-ho popcorn epic of the BATTLE:LA type - this is a thoughtful, improvised story of survival and how we treat the outsiders in our society. The last point may not have been Edwards' express intent, but it's certainly a feature. Real-life husband and wife Scoot McNairy and Whitney Able are convincing as characters simply because - in their improvised dialogue - they are talking how a real couple would. Able is particularly praiseworthy, puncturing the stereotype of a rich heiress - this lady is no damsel in distress - but she brings a vulnerability that is relateable, even in such extreme circumstances. You find out little about these characters, apart from in phone calls to those they're ostensibly trying to get home to, yet you come to care about them and speculate where this journey will take them in the future.