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 Rowan Bacal Greta Matt Berry Nitwit (voice) Alice May Connolly Alex Double Jens Bergensten Waiter Oliver Brotherhood Auction Attendee