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Alfred MolinaProfessor Knight (voice)
Aisha TylerMillie (voice)
Stephen StantonSmitty / Needleman (voice)
Dee Bradley BakerBanana Bread (voice)
Alanna UbachCutter / Maria / Carla (voice)
Nathan FillionJohnny (voice)
Jenifer LewisGrandma Tuskmon (voice)
Ali WongJill (voice)
Joe Lo TruglioJack (voice)
John RatzenbergerBernard (voice)
Christopher SwindlePhlegm / Rudy / Additional Monsters (voice)
Roxana OrtegaCelia Mae (voice)
Alan KimBen (voice)
Aubrey PlazaClaire (voice)
Julia ButtersLorelei (voice)
Sander ArgabriteJ.J. (voice)
Nohely QuirozMNN Receptionist / MU Student (voice)
Natalie LashkariLittle Girl Monster (voice)
Max MittelmanRΩR Bro / Large Monster / Student Monsters (voice)
Carlos AlazraquiJosh Rivera / Jebediah (voice)
Romi DamesLanky / Student Monsters (voice)
Kimberly BrooksAdditional Monsters (voice)
Billy CrystalMike (voice)
John GoodmanSulley (voice)
Ben FeldmanTylor (voice)
Mindy KalingVal (voice)
Henry WinklerFritz (voice)
Lucas NeffDuncan (voice)
