"I don't know what I'm doing wrong, I've lost my influence," mourns Gibson's Father Christmas in the EW exclusive video above. "All I have is a loathing for a world that's forgotten."
In this dark action comedy, Chris Cringle's "business" is in decline so Santa enters into a partnership with the U.S. military for extra cash. Meanwhile, Santa gets "locked into a deadly battle of wits against a highly-skilled assassin (Walton Goggins), hired by a precocious 12-year-old who received a lump of coal in his stocking."
"I've come for your head, fatman!" warns Goggins' assassin in the trailer.
"You think you're the first?!" shoots back Santa. "You think I got this job because I'm fat and jolly?"
There are also gunfights, menacing reindeer, a decrepit sleigh, and gluttonous elves.
Fatman is from writer-directors Eshom Nelms and Ian Nelms (Waffle Street).