Thirty years ago, aliens arrive on Earth – not to conquer or give aid, but – to find refuge from their dying planet. Separated from humans in a South African area called District 9, the aliens are managed by Multi-National United, which is unconcerned with the aliens' welfare but will do anything to master their advanced technology. When a company field agent (Sharlto Copley) contracts a mysterious virus that begins to alter his DNA, there is only one place he can hide: District 9.