
Plot
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.
Trailer
Cast

Robert Timothy Smith
Liam Turner

Jack Black
Satan

Keegan-Michael Key
Dr. Finkleman

Brianne Howey
Molly Turner

Hayes MacArthur
Bill Turner

P.J. Byrne
Mr. Charles

Jaden Carson Baker
Gibby

Kai Cech
Emma

Post Malone
Post Malone

Gavin Munn
Aidan

Cate Freedman
Crossing Guard

Ben Stiller
Lucifer (uncredited)

Kyle Gass
Science Teacher

Lee Reyes
Lee

Bash Hagelin
Joey

Bryson Dean Haney
Grayson

Lindsay Rootare
Technician

Luke Chiappetta
Jock

Greg Clarkson
Male Newscaster

Maiya Moran
Female Newscaster

Leo Easton Kelly
Spencer

Tierre Turner
Blitzen (voice)

Carole Kaboya
Little Kid’s Mom

Travon McEntyre
Male Nurse

Izzy Herbert
Flirty Girl

Selah Kimbro Jones
Attractive Girl

Abe Farrelly
Tattoo Tony