Saturday box office update:
The big blue legs of James Cameron's "Avatar" have continued their epic sprint into week seven, dropping only 19 percent at the domestic box office Friday and once again leading all comers with $7.3 million, according to studio estimates.
The Fox-distributed 3D film is expected to finish the weekend with nearly $593 million in North American gross, leaving it about $7 million shy of "Titanic's" $600 million all-time domestic record. It's also on the cusp of passing the $2 billion mark worldwide... which is an impressive feat, regardless of the movie's ability to charge premium 3D ticket prices.
In second place, Mel Gibson's return to feature-film stardom after an eight-year absence yielded a $5.6 million opening for Warner R-rated thriller "Edge of Darkness," with the film performing just slightly above the studio's lukewarm estimates.
Budgeted at $60 million, adapted from a 25-year-old BBC miniseries and produced by GK Films, "Edge" is pacing for a $16.5 million weekend. Warner has domestic distribution rights for the movie.
Also opening wide this weekend, Disney romantic comedy "When in Rome," starring Kristen Bell and Josh Duhamel, finished third Friday, grossing $4.3 million, also slightly above forecast. The film is on track for a $12 million weekend.
Overall, the domestic box office was off about 8 percent from the comparable Friday a year ago, which led into Super Bowl weekend.
Among holdovers, Fox family film "The Tooth Fairy" held up well, dropping only 36 percent from its premiere a week earlier and grossing $2.3 Friday.
Dropping big, however, was Sony/Screen Gems killer-angels movie "Legion," which took in $2 million Friday for a 70 percent decline.
Also, CBS Films debut "Extraordinary Measures" fell out of the top 10 in its second Friday, dropping 63 percent to $760,000.
Here's how the top 10 at the domestic box office shaped up Friday:
Avatar ($7.3 mil.)
Edge of Darkness ($5.7 mil.)
When in Rome ($4.3 mil.)
Book of Eli ($2.5 mil.)
The Tooth Fairy ($2.3 mil.)
Legion ($2.0 mil.)
The Lovely Bones ($1.3 mil.)
Sherlock Holmes ($1.2 mil.)
It’s Complicated ($1.0 mil.)
Alvin and the Chipmunks: The Squeakquel ($0.8 mil.)
Thursday preview:
It's a phenomenon that, this January at least, is as rare as a blue moon: “Avatar” won't be breaking any records this weekend.
That won't much help Mel Gibson's return to the big screen, however.
Already the all-time leader globally and internationally, "Avatar" still trails “Titanic” by just under $40 million for the domestic revenue record of $600.8 million, according to Box Office Mojo data. Even if James Cameron's epic sustains this run -- the film declined only 18.3 percent last weekend -- it'll exit this weekend roughly $12 million short.
Still, “Avatar” is once again expected to rule the domestic box office in its seventh week. The consolation round pits the Gibson thriller “Edge of Darkness” against the Kristen Bell romantic comedy “When in Rome."
Warner Bros. "Darkness" is adapted from a 25-year-old BBC series by screenwriter William Monahan, and features Gibson in his first starring role since 2002’s “Signs” and “We Were Soldiers.”

