Jason Momoa as Garrett

Jack Black as Steve

Sebastian Eugene Hansen as Henry

Emma Myers as Natalie

Danielle Brooks as Dawn

Jennifer Coolidge as Vice Principal Marlene

Rachel House as Malgosha (voice)

Allan Henry as Malgosha (Creature Performer)

Bram Scott-Breheny as Young Steve

Moana Williams as Young Garrett

Jemaine Clement as Daryl / Bruce (voice)

Mark Wright as HR Person

Yvette Parsons as Delivery Person

Hiram Garcia as Mr. Gunchie

Bret McKenzie as Nitwit Onset Performer

Jared Hess as General Chungus (voice)

Batanai Mashingaidze as Matty the Waitress

Amanda Billing as Henry's Mother

Tommy Broadmore as Trevor

Frankie Creagh-Leslie as Trevor's Friend

Alison Quigan as Chuggy Executive #1

John Smythe as Chuggy Executive #2

Alex Tunui as Secretary

Craig Mckinney as Miner

Joel Rindelaub as Arcade Judge

Antony Degreat as Gamer #1

Victor Kazaroho as Gamer #2

Ben Carpenter as Henry Picture Double

Rowan Bacal as Greta

Brennan Standing as Lee

Dylan Chitekwe as Miles

Matt Berry as Nitwit (voice)

Alice May Connolly as Alex Double

Jens Bergensten as Waiter

Oliver Brotherhood as Auction Attendee

Daniel Middleton as Auction Attendee

Elizabeth Batty as Auction Attendee

Jessica Bravura as Auction Attendee

Kate McKinnon as Alex (voice) (uncredited)