Bobs Gannaway

Roto (voice)

Bob Peterson

Roz (voice)

Nathan Fillion

Johnny (voice)

Ali Wong

Jill (voice)

Joe Lo Truglio

Jack (voice)

Roxana Ortega

Celia Mae (voice)

Alan Kim

Ben (voice)

Kimberly Brooks

Additional Monsters (voice)

Alanna Ubach

Cutter / Carla (voice)

Rhys Darby

Roger Rogers (voice)

Bobby Moynihan

Chet (voice)

Kurtwood Smith

Alistair Clawbottom (voice)

Stephen Stanton

Sanderson (voice)

Paula Pell

Sunny (voice)

Richard Ayoade

Declan (voice)

Janelle James

Joy (voice)

Jimmy Tatro

Skyler (voice)

Ethan Sandler

Stubby Lizzardo (voice)

Corey Burton

Slappy (voice)

Bowen Yang

Carter (voice)

Billy Crystal

Mike (voice)

John Goodman

Sulley (voice)

Ben Feldman

Tylor (voice)

Mindy Kaling

Val (voice)

Henry Winkler

Fritz (voice)

Lucas Neff

Duncan (voice)

Steve Buscemi

Randall (voice)

Christopher Swindle

M.E.R.C. Official 2 / Phlegm / Additional Monsters (voice)

Dee Bradley Baker

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

Alan Tudyk

M.E.R.C. Official 1 / Alarmed Monster (voice)

Romi Dames

Lanky (voice)

Nohely Quiroz

Additional Monsters (voice)

Max Mittelman

Additional Monsters (voice)

Stevie Wermers-Skelton

Swamp Woman (voice)