District 9 features a cast of largely unknown actors
Sci-fi drama District 9 has landed at the top of UK and Ireland box office, knocking 3D horror movie The Final Destination into second place.
This week's number one took £2.2m in its three days, holding off competition from quirky comedy (500) Days Of Summer, which debuted at three.
Quentin Tarantino's idiosyncratic war film Inglourious Basterds fell two places to number four, taking £764,454.
Funny People, directed by comedy guru Judd Apatow, rounded off the top five.
The movie, which stars Adam Sandler and Seth Rogan as stand-up comedians, was at number two last week.
US BOX OFFICE TOP FIVE
1. District 9 - £2.2m
2. The Final Destination - £1.9m
3. (500) Days Of Summer - £1.2m
4. Inglourious Basterds - £764,454
5. Funny People - £586,417
Source: Screen International
In sixth place was knockabout family comedy Aliens In The Attic, followed by literary adaptation The Time Traveller's Wife, starring Eric Bana and Rachel McAdams.
Disney's guinea-pig animation G-Force made £349,987, and was at number eight.
Harry Potter And The Half Blood Prince, the sixth movie in the boy wizard franchise, dropped to ninth place.
The film, starring Daniel Radcliffe, has taken a total of £50.2m since it opened in July.
Penelope Cruz's latest film Broken Embrace, directed by Spanish auteur Pedro Almodovar, remained at number 10 in this week's chart.