Ty Simpkins as Dalton Lambert

Patrick Wilson as Josh Lambert

Rose Byrne as Renai Lambert

Lin Shaye as Elise Rainier

Sinclair Daniel as Chris Winslow

Hiam Abbass as Professor Armagan

Andrew Astor as Foster Lambert

Juliana Davies as Kali Lambert

Steve Coulter as Carl

Peter Dager as Nick the Dick

Joseph Bishara as Lipstick Demon

Angus Sampson as Tucker

Leigh Whannell as Specs

Justin Sturgis as Alec Anderson

David Call as Smash Face / Ben Burton

Stephen Gray as Sick Kid

Robin S. Walker as Supervisor Robbins

Bridget Kim as Sorority Girl #1

Logan Wilson as Paige

Kasjan Wilson as Young Dalton / Young Josh

Mary Looram as Mourner

Adrian Acosta as Frat Boy #1

AJ Dyer as Frat Bro #2

Kalin Wilson as Server Frat Boy

E. Roger Mitchell as Dr. Bower

Dagmara Dominczyk as Priest (voice)

Tom Toland as Student (credit only)

Elaine Apruzzese as Pedestrian / Driver (uncredited)

Suki Úna Rae as Art Student (uncredited)

Desi Ramos as Student (uncredited)

Victorya Danylko-Petrovskaya as Sorority Girl (uncredited)