Joss ("Buffy the Vampire Slayer") Whedon's sci-fi TV series "Firefly" has found a new life at movie theaters. Good news is, you don't have to be familiar with the series to jump right into this space-age Western. It's a galaxy far, far away and the war over a newly colonized solar system has just ended. The winners--the Alliance--rule with the usual iron fist, while the losers--the Independents--tool around like frontier cowboys. The crew of the Serenity is your usual ragtag bunch of rebels and rogues, robbing spaceships and trying to bring down the man. The film's slim budget keeps the action confined mostly to sets. But the dialogue is sharp as ever, the tone lighthearted and the characters well-written.119 minutes PG-13.