In post-Sept. 11 Los Angeles, tensions erupt when the lives of a Brentwood housewife, her district attorney husband, a Persian shopkeeper, two cops, a pair of carjackers and a Korean couple converge during a 36-hour period.

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 contracts a mysterious virus that begins to alter his DNA, there is only one place he can hide: District 9.