Fatman centers on a neglected and precocious 12-year-old who hires an unorthodox hitman to kill Santa Claus (Gibson) after receiving a lump of coal in his stocking.
Rough House Pictures is producing along with Todd Courtney of Mammoth Entertainment with Mammoth now set to finance.
Rough House partners Danny McBride, David Gordon Green, and Jody serve as executive producers.
Rough House’s Brandon James, Fortitude’s Nadine de Barros, Skywolf’s Lisa Wolofsky, Michelle Lang, and Robert Menzies are also producing.