A group of London teens find themselves in the middle of an alien invasion and fight to defend their tower block from some evil extraterrestrials in this stylish sci-fi romp from the producers of Shaun of the Dead and Scott Pilgrim vs. the World. Beset by a gang of young thugs as she passes through a South London housing estate on her way home, Sam (Jodie Whittaker) is in the midst of being robbed when a rampaging alien falls down from the stars and attacks. Later, as the police assist Sam in pursuing her assailants, strange lights start to rain down on the streets, heralding the arrival of a second, more ferocious, wave of creatures. With the city under siege, there's no place left to run. Quickly realizing she's going to have to fight if she wants to survive, Sam tracks down the street-tough teens that were in the midst of mugging her when the invasion began, and vows to battle alongside them to the bitter end. Nick Frost, John Boyega, and Luke Treadaway co-star.