"Mamma Mia!" replaced "The Dark Knight" as the top-selling DVD in the United States, according to Nielsen VideoScan data issued Wednesday.

The Batman sequel, released December 9, remains the top-selling video release of the year, with an estimated worldwide total of 13.5 million units sold its first week out, 1.7 million of them on the nascent Blu-ray Disc format.

On trade publication Home Media Magazine's rental chart, top honors went to "The Mummy: Tomb of the Dragon Emperor," which also bumped "The Dark Knight" to No. 2. "Mamma Mia!" debuted at No. 3.
"Dark Knight" remained the No. 1 Blu-ray Disc seller for the second week, according to Nielsen VideoScan. "The Mummy" debuted at No. 2, with "Mamma Mia!" at No. 3.