When a puny and decidedly smelly alien crashes into the wrong council estate one night in south London, the delinquent neighbourhood teens make short work of it. But nobody - not the teens, not the local drug gangs, not the police - is prepared for the ensuing invasion of much larger, sharper-teethed, and numerous partners of the first alien. A night of bloody mayhem ensues, in which the youths - particularly brooding and determined leader Moses - must reckon not only with vicious aliens but predatory adult criminals, the prejudice of the police and their neighbours, and ultimately, Responsibility.
Yes, Responsibility with a capital R. The movie also tackles Important Social Questions, but to its credit, Attack the Block never gets hackneyed or preachy; there's far too much suspense and danger for that. (The likeable and well-differentiated heroes are constantly in real danger, and - spoiler alert - they don't all make it.) The movie also brims over with the irrepressible energy of the young protagonists; once you get used to their accents and slang, the humour is infectious.
Terrific and satisfying flick. Buy buy buy.