Look for the Dark Knight and the Joker under your Christmas tree. DVD sales for The Dark Knight are off to a very fast start.

Batman ruled the home entertainment charts the week ending Dec. 14, as Warner Home Video’s “The Dark Knight” became not just the week’s top seller, but also one of the two best-selling home video releases so far this year.

“The Dark Knight” sold more than 10 million discs its first week in stores, Warner reported. Factoring in sales to rental dealer as well as consumers, “The Dark Knight” sold 13.5 million discs worldwide, including a record 1.7 million on the nascent high-definition Blu-ray Disc format.

In addition, nearly 300,000 purchasers of the “Dark Knight” disc activated the digital copy that came packaged with it, Warner reported.

After just one week in stores, “The Dark Knight” is already nipping at the heel’s of the year’s top-selling home video release, Paramount/DreamWorks’ “Iron Man.” It is expected to surpass “Iron Man” to become the year’s top seller within the coming week.