Spencer Grinberg
— Tommy (voice) / Principal McGuffin (voice)
Francis Melling
— Wendell (voice)
Catherine Zanon
— Sally (voice) / Ms.Dingleberry (voice)
Sandro Rosta
— Punch
Vienna Brandstatter
— Vasilika
Matt Alfano
— Patches (voice)
Mateo Galindo-Torres
— Joaquin
Tyler Burstein
— Boris
Neil Hewitt
— Mr. Friendly
Ted Powers
— Janitor
Mark Boutros
— Harold
Elizabeth Dundas
— Linda
Justin Wilson
— Additional voices (voice)
Aaron Rubinoff
— Additional voices (voice)