Billy Crystal
Mike Wazowski (voice) (10 eps)
John Goodman
James P. 'Sulley' Sullivan (voice) (10 eps)
Ben Feldman
Tylor Tuskmon (voice) (10 eps)
Mindy Kaling
Val Little (voice) (10 eps)
Henry Winkler
Fritz (voice) (10 eps)
Lucas Neff
Duncan P. Anderson (voice) (10 eps)
Alanna Ubach
Katherine 'Cutter' Sterns (voice) (10 eps)
Stephen Stanton
Smitty / Needleman / Sanderson / Chuck (voice) (10 eps)
Christopher Swindle
Additional Monsters (voice) (9 eps)
Bob Peterson
Roze / Bob Peterson (voice) (8 eps)
Jennifer Tilly
Celia Mae (voice) (8 eps)
Michaela Dietz
Snore (voice) (7 eps)
Romi Dames
Kurtz / Josephina (voice) (7 eps)
Bonnie Hunt
Ms. Flint (voice) (6 eps)
Roberts Gannaway
Roto / Otis (voice) (5 eps)
Dee Bradley Baker
Additional Monsters (voice) (4 eps)
John Ratzenberger
Yeti (voice) (3 eps)
Carlos Alazraqui
Additional Monsters (voice) (3 eps)
Curtis Armstrong
Mr. Crummyham (voice) (3 eps)
Dave Wittenberg
Additional Monsters (voice) (2 eps)
Gabriel Iglesias
Gary (voice) (2 eps)
Alfred Molina
Professor Knight (voice) (1 eps)
Ferrell Barron
Additional Monsters (voice) (1 eps)
Aisha Tyler
Millie (voice) (1 eps)
Bob Uecker
Bob Yucker (voice) (1 eps)
John Michael Higgins
Argus Blinks (voice) (1 eps)
Hadley Gannaway
Thalia (voice) (1 eps)
Devin Bright
Marcus (voice) (1 eps)
Cooper J. Friedman
Alexander (voice) (1 eps)
Lucian Perez
Oscar (voice) (1 eps)
Isabella Abiera
Gurty (voice) (1 eps)