When Buffy the Vampire Slayer creator Joss Whedon looks back on 2005, he can take comfort in knowing that his film-directing debut, the sci-fi Western Serenity, resurrected his canceled-too-soon cult classic TV series Firefly, and was also one of the year's best-reviewed movies. ''I should say I'm above reading reviews,'' he says. ''But I would be lying.'' Alas, Whedon's fond memories are also tainted by Serenity's status as a franchise nonstarter; despite Universal's best marketing efforts, the film only mustered $25 million. ''In the end, it was what it was: a tough sell,'' says Whedon, adding that it appears the Firefly saga has reached its conclusion. He has no regrets and he's moving on. He's currently penning a Wonder Woman flick for Warner Bros., and has the thriller Goners set up at Universal; he'll direct whichever gets a green light first. Buffy's papa has more Slayer stuff in the pipeline as well: an ongoing comic book (''the eighth season we never made''), and possibly a series of DVD flicks focusing on characters like platinum bloodsucker Spike. As for Serenity, ''I have closure,'' he says. ''And now, I can have it in my home which means that finally I can actually stop working on it.''