!Empower!

The plot according to Wikipedia -

Aliens made first contact with Earth twenty-eight years prior to the beginning of the film, after which humanity waited for either a hostile attack or for giant advances in technology, though neither came. Instead, the aliens that arrived were refugees, the last survivors of their home world. The creatures were set up in a makeshift home in South Africa's District 9 as the world's nations argued over what to do with them. Patience over the alien situation ran out and control over them was contracted out to Multi-National United (MNU), a private company uninterested in the aliens' welfare. MNU stands to receive tremendous profits if they can make the aliens' advanced weaponry work.

MNU, thus far, has failed in making the alien weaponry work, for activation of the weaponry requires alien DNA. Tension between the aliens and the humans comes to a head when an MNU field operative, Wikus van der Merwe (Sharlto Copley), through playing around with an alien device, contracts a mysterious virus that begins changing his DNA. Wikus quickly becomes the most hunted man in the world, as well as the most valuable, for he is the key to unlocking the secrets of alien technology. Van der Merwe becomes ostracized and friendless and comes to hide in District 9.

While on the run from MNU, Wikus is forced to seek refuge in the run down shack of an alien called Christopher Johnson, the same alien attempting to distill fuel from scavenged space ship parts scattered around District 9. Although initially hostile towards Wikus, Christopher eventually agrees to assist him reverse the transformation. Christopher can undo the mutation if he were able to get Wikus inside the mother ship hovering over Johannesburg. Ironically, to do so requires the contents of the alien device Wikus confiscated and accidentally sprayed himself with earlier in the film.

Wikus manages to steal some alien weaponry and with Christopher's help they launch an assault on MNU and successfully retrieve the fuel sample required to power a shuttle up to the mother ship. Wikus and Christopher return to District 9 and Christopher admits the process involved to cure Wikus could take up to three years to complete. Furious, Wikus knocks Christopher unconscious and powers up the ship himself. The military target Wikus and destroy one of the shuttles engines, causing it to crash land inside District 9. A battle between the military and a local group of thugs begins to rage, both groups wish to control Wikus (the military want to dissect him to gain an understanding of how to use alien technology and the thugs believe if they eat his alien arm they will gain his power). Christopher's son Little CJ gains control of a mechanized battle suit from inside the crashed shuttle and helps free Wikus. Wikus then commandeers the battle suit and defends Christopher as the mother ship uses a tractor beam to lift it on board.

As the shuttle docks with the mother ship, Wikus is shot in the back and the suit ejects him after taking critical damage. Wikus drags himself away from the general following him, but is unavoidably caught. Just before the trigger is pulled, four aliens burst out of the surrounding slums and attack Wikus' attacker, dismembering him.

The film concludes with news broadcasts on the humans view on what happened and an interview with Wikus' wife reveals a small metal rose was left on her doorstep (one of Wikus' trademarks, he strongly believed a gift is worth more if it was made personally). She concludes it couldn't possibly be Wikus, no one has heard from him since he was last seen crawling from the mangled battle suit. An alien is then seen standing in a junk yard inside District 9, fashioning a small metal rose out of scrap metal, implying Wikus' transformation is complete

The fictional District 9 is located in what is actually Katlehong, a township in Johannesburg, South Africa.