Tylor Tuskmon
Ben Feldman
Val Little
Kelly Marie Tran
Fritz (voice)
Henry Winkler
Mike Wazowski (voice)
Billy Crystal
Katherine 'Cutter' Sterns (voice) / Carla (voice) / Rosie
Alanna Ubach
James P. 'Sulley' Sullivan (voice)
John Goodman
Duncan P. Anderson (voice) / Father (voice) / Richard (voice)
Lucas Neff
Celia Mae
Jennifer Tilly
Smitty / Needleman / Sanderson (voice)
Stephen Stanton
Bernard (voice) / Adorable (voice) / Adorable
John Ratzenberger
Millie Tuskmon
Aisha Tyler
Val Little (voice)
Mindy Kaling
Roze (voice) / Roz (voice) / Roze
Bob Peterson
Phlegm (voice) / Fungus (voice) / Phlegm
Christopher Swindle
Tylor
Millie
Banana Bread (voice) / Additional Monsters (voice) / Chauncey
Dee Bradley Baker
Additional Monsters (voice) / Lanky / Student Monsters (voice)
Romi Dames
Roto (voice) / Otis / Roto
Roberts Gannaway
Ms. Flint (voice)
Bonnie Hunt
Additional Monsters (voice) / Snore (voice)
Michaela Dietz
Johnny (voice)
Nathan Fillion
Business Monster (voice) / Restaurant Patrons (voice) / David
Carlos Alazraqui
Roger Rogers (voice)
Rhys Darby