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- Jack Black as Dewey Finn
- Joan Cusack as Principal Rosalie "Roz" Mullins
- Mike White as Ned Schneebly
- Sarah Silverman as Patty De Marco
- Miranda Cosgrove as Summer "Tinkerbell" Hathaway
- Joey Gaydos Jr. as Zack "Zack-Attack" Mooneyham
- Kevin Clark as Freddy "Spazzy McGee" Jones
- Rebecca Brown as Katie "Posh Spice"
- Robert Tsai as Lawrence "Mr. Cool"
- Maryam Hassan as Tomika "Songbird"
- Caitlin Hale as Marta "Blondie"
- Aleisha Allen as Alicia "Brace Face"
- Brian Falduto as Billy "Fancy Pants"
- Zachary Infante as Gordon "Roadrunner"
- James Hosey as Marco "Carrot Top"
- Angelo Massagli as Frankie "Tough Guy"
- Cole Hawkins as Leonard "Short Stop"
- Jordan-Claire Green as Michelle
- Veronica Afflerbach as Eleni
- Adam Pascal as Theo
- Lucas Babin as Spider
- Lucas Papaelias as Neil
- Shawn Rodney as Shawn