Not content with a historic box office take in theaters, The Dark Knight is now just showing off by outselling all but one of this year's other DVDs - within a week of release.

The one movie that hasn't been outsold by Chris Nolan's behemoth this year is Marvel's Iron Man - and that may even have changed by the time that you read these words. In its first week of release, Dark Knight sold an amazing 13.5 million copies worldwide, including a record 1.7 million Blu-Ray discs.

In related news, all movie studios have announced that they will only be making really long, dark movies about superheroes from now on.

'Knight' tops annual sales in 1 week [Variety], 'Dark Knight's' DVD bow is heroic [Hollywood Reporter]

Send an email to Graeme McMillan, the author of this post, at graeme@io9.com.