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'Unknown' Bests 'I Am Number Four' on Sluggish Holiday Weekend to Take No. 1 With $21.8 Mil

DreamWorks and Touchstone's teen sci-fi adventure lands at No. 2 with softer-than-expected $19.5 million as newcomer 'Big Mommas' opens in fifth place.

In another win for Liam Neeson and his adult fans, Warner Bros. and Dark Castle Entertainment's action-thriller Unknown scored a surprise victory in besting Alex Pettyfer teen sci-fi adventure I Am Number Four at the President's Day box office.