Likeable 6th grader Liam writes to Santa asking him to prove that he's real. But Liam is dyslexic and accidentally sends his letter to Satan instead, who shows up at Liam's house, excited to have his first fanboy letter and wanting a little of Liam's soul.
Robert Timothy Smith
as Liam Turner
Jack Black
as Satan
Keegan-Michael Key
as Dr. Finkleman
Brianne Howey
as Molly Turner
Hayes MacArthur
as Bill Turner
P.J. Byrne
as Mr. Charles
Jaden Carson Baker
as Gibby
Kai Cech
as Emma
Post Malone
as Post Malone
Gavin Munn
as Aidan
Cate Freedman
as Crossing Guard
Ben Stiller
as Lucifer (uncredited)
