By Bruce Dancis, The Sacramento Bee, Calif. Aug. 5--"The Dark Knight" is on a mission of "Titanic" proportions.

LOS ANGELES - Batman's joust with the Joker has set another box office record. Stoked by fan fever over the manic performance of the late Heath Ledger as the Joker, "The Dark Knight" set a one-day box office record with $66.4 million on opening day, Warner Bros.

Batman's joust with the Joker has set another box office record.

By Bob Tourtellotte LOS ANGELES (Reuters) - Big-budget action movie "Superman Returns" raked in an estimated $21 million from its debut at U.S. box offices, including early previews, film studio Warner Bros. said on Thursday.