Ethan Sandler

Stubby Lizzardo (voice)

Bobs Gannaway

Roto (voice)

Ferrell Barron

Additional Monsters (voice)

Kevin Deters

DJ Slinky Stinkwell (voice)

Dan Molina

Ethan (voice)

Alfred Molina

Professor Knight (voice)

Aisha Tyler

Millie (voice)

Bob Uecker

Bob Yucker (voice)

Dave Wittenberg

Fan Monster (voice)

John Michael Higgins

Argus Blinks (voice)

Michaela Dietz

Snore (voice)

Bob Peterson

Roz / Bob Peterson (voice)

Hadley Gannaway

Thalia (voice)

Devin Bright

Marcus (voice)

Cooper J. Friedman

Alexander (voice)

Lucian Perez

Oscar (voice)

Isabella Abiera

Gurty (voice)

Gabriel Iglesias

Gary (voice)

Jennifer Tilly

Celia Mae (voice)

John Ratzenberger

Yeti (voice)

Bonnie Hunt

Ms. Flint (voice)

Curtis Armstrong

Mr. Crummyham (voice)

Stephen Stanton

Smitty / Needleman / Sanderson / Chuck (voice)

Nathan Fillion

Johnny (voice)

Jenifer Lewis

Grandma Tuskmon (voice)

Ali Wong

Jill (voice)

Joe Lo Truglio

Jack (voice)

Christopher Swindle

Phlegm

Alan Kim

Ben (voice)

Carlos Alazraqui

John Rivera (voice)

Aubrey Plaza

Claire (voice)

Julia Butters

Lorelei (voice)

Sander Argabrite

J.J. (voice)

Kimberly Brooks

Additional Monsters (voice)

Dee Bradley Baker

Banana Bread / Chompy / Swamp Man / Angry Citizen (voice)

Rhys Darby

Roger Rogers (voice)

Romi Dames

Hazel (voice)

Bobby Moynihan

Chet (voice)

Danny Pudi

Evan (voice)

Kurtwood Smith

Alistair Clawbottom (voice)

Danny Trejo

Terry (voice)

Cody Rigsby

Spin-Energy Instructor Monster (voice)

Natalie Lashkari

Monster Kids (voice)

Ryan McPartlin

Bully Monster 1 / Mr. April (voice)

Alanna Ubach

Cutter / Carla / Maria (voice)

Emily Peterson

Restaurant Patrons (voice)

Roxana Ortega

Celia Mae (voice)

Paula Pell

Sunny (voice)

Corey Burton

C.R.E.E.P. WOrker / Sloppy (voice)

Rania Sharkawy

Avani (voice)

Richard Ayoade

Declan (voice)

Janelle James

Joy (voice)

Max Mittelman

Kenny / Brian (voice)

Jennifer Coolidge

Marilyn (voice)

Lucas Neff

Duncan / Richard (voice)

Evan Ridpath

Tiny Monster (voice)

Jimmy Tatro

Skyler (voice)

Nohely Quiroz

MNN Receptionist / MU Student (voice)

Stevie Wermers-Skelton

Swamp Woman (voice) · Scream Con Mascot / Bully Monster 2 (voice)

Bowen Yang

Carter (voice)

Billy Crystal

Mike (voice)

Aubrey Matalon

Scarlett (voice)

John Goodman

Sulley (voice)

Ben Feldman

Tylor (voice)

Alan Tudyk

Pierre / Michel / Maître d' (voice)

Mindy Kaling

Val (voice)

Henry Winkler

Fritz (voice)

Steve Buscemi

Randall (voice)

Tessa Rozanski

Hilary / Sweet Kid (voice)

Sam Deters

Not Valet Monster (voice)