Jason Momoa

Garrett

Jack Black

Steve

Sebastian Eugene Hansen

Henry

Emma Myers

Natalie

Danielle Brooks

Dawn

Jennifer Coolidge

Vice Principal Marlene

Rachel House

Malgosha (voice)

Allan Henry

Malgosha (Creature Performer)

Bram Scott-Breheny

Young Steve

Moana Williams

Young Garrett

Jemaine Clement

Daryl / Bruce (voice)

Mark Wright

HR Person

Yvette Parsons

Delivery Person

Hiram Garcia

Mr. Gunchie

Bret McKenzie

Nitwit Onset Performer

Jared Hess

General Chungus (voice)

Batanai Mashingaidze

Matty the Waitress

Amanda Billing

Henry's Mother

Tommy Broadmore

Trevor

Frankie Creagh-Leslie

Trevor's Friend

Alison Quigan

Chuggy Executive #1

John Smythe

Chuggy Executive #2

Alex Tunui

Secretary

Craig Mckinney

Miner

Joel Rindelaub

Arcade Judge

Antony Degreat

Gamer #1

Victor Kazaroho

Gamer #2

Ben Carpenter

Henry Picture Double

Rowan Bacal

Greta

Brennan Standing

Lee

Dylan Chitekwe

Miles

Matt Berry

Nitwit (voice)

Alice May Connolly

Alex Double

Jens Bergensten

Waiter

Oliver Brotherhood

Auction Attendee

Daniel Middleton

Auction Attendee

Elizabeth Batty

Auction Attendee

Jessica Bravura

Auction Attendee

Kate McKinnon

Alex (voice) (uncredited)