All 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
