Jack Black will star in the Christmas comedy Dear Santa. The movie centers on a young boy, who in writing his yearly note to Santa, mixes up the letters and sends it to Satan instead. Black recently teased the project on social media when he posted a photo of him posing with some Christmas decorations with no context that got everyone talking about what it could be. Featured alongside Black is Robert Timothy Smith, as well as a supporting cast that includes Keegan-Michael Key, Brianne Howey, Hayes MacArthur, PJ Byrne newcomer Jaden Carson Baker, Kai Cech and Austin Post. No word on a release date.