- Daran Norris - Gordy
- Daran Norris - Gordy / Cosmo (voice)
- Shelbie Bruce - Patty
- Alan Thicke - Hal E. Burton
- Don Creech - Mr. Sweeney
- Josh Server - Speedy Delivery Guy
- Judy Tenuta - Mrs. Holler
- Spencer Locke - Bitsy Johnson
- Vincent Martella - Scoop
- Carmelo Anthony - Carmelo Anthony
- Corbin Bleu - Spencer
- Melissa Peterman - Mrs. Splitz
- Romeo Miller - Romeo
- Fabio - Fabio
- Lucy Hale - Amy Cassidy
- Willie Gault - Sportscaster #2
- Serena Berman - Marva Qwerly
- Rob Pinkston - Coconut Head
- Meshach Taylor - Mr. Wright
- Carlie Casey - Missy Meany
- Loni Love - Rose, the Lunch Lady
- John Bliss - Principal Irving Pal
- Dave Florek - Mr. Chopsaw
- Cameron Monaghan - Palmer Noid
- Rolonda Watts - Ms. Morrison
- Van Earl Wright - Sportscaster #1
- Alex Black - Seth Powers
- Mo Collins - iTeacher
- Tylor Chase - Martin Qwerly
- Lusia Strus - Dr. Xavier
- Richard Cansino - Mr. Phorchin
- Brooke Marie Bridges - Claire Sawyer
- Aimee Teegarden - Girl #2
- Connie Sawyer - June
- Mat Hoffman - Mat Hoffman
- Christian Serratos - Suzie Crabgrass
- Nathan Norman - Todd Rideg
- Rich Ceraulo Ko - Speech
- Tristin Mays - Bernice
- Ford Austin - EMT #2
- Kendre Berry - Backpack Boy
- Tina Gilton - Student #2
- Aaron Grady - Backpack Boy
- Kim Sava - Ms. Dirga
- Paula Van Oppen - Girl #3
- Mary Bogue - Nurse Hunsucker
- Marquise c. Brown - Chandra Taylor
- Steve Bannos - Mr. Combover
- Steve Bannos - Mr. Gross
- Teo Olivares - Jerry Crony
- Linda Cevallos - Miss Enstile
- Charles Rahi Chun - Mr. Dren
- Dylan Kasch - Lead 8
- Vivien Straus - Marla, the Zoo Keeper
- Sean Michael Afable - Stinger
- Carlos PenaVega - King Bee
- Steven Poirier - AV Kid
- Pedro Miguel Arce - Sumo Cookie
- Stephen Grove Malloy - Emotionless Cookie
- Danielle Riffenburgh - Girl #1
- Deren Tadlock - Handsome Cookie
- Cathy Immordino - Sandy Crew
- Raymond Braun - Kid #1
- Fred Williamson - Coach Stax
- Susanne Blakeslee - Wanda (voice)
- Ca'Shawn Sims - Student
- Neilen Benvegnu - Ted
- Tessa Ludwick - Jennifer Tu
- Dave Allen - Mr. Kwest
- Dave Allen - Abe Lincoln
- Dave Allen - Mr. Kwest / Abe Lincoln
- Steffinnie Phrommany - Music Video Girl
- Timothy Starks - EMT #1
- Timothy Starks - Hector, the Orderly
- Vanessa Villalovos - Model
- Logan Browning - Vanessa
- Len Levitt - Puppeteer
- Christian McClure - Pillow Locker Guy
- Hamilton Mitchell - Vice Principal Crubbs
- Diego DiGiovanni - Student
- Amanda Alch - May
- Kelly Vitz - Julie
- Mark Fite - Benedict Arnold
- Mark Fite - Emotion
- Hunter Gomez - New English Kid
- Trevor Stevens - Shake Down Boy
- Trevor Stevens - Wig Boy
- Jelynn Sophia - Miss Modelle
- Marc Weiner - Mr. Weiner
- Paul Diaz - Doug Secksay
- Andrea Sixtos - Doug Girl #1
- Vinicius Zorin-Machado - Faymen Phorchin
- Vinicius Zorin-Machado - Faymen Phorchin (archive footage)
- Colby O'Donis - Nelson Duckworth / Quack
- Travis Stevens - Museum Security Guard
- Fred Stoller - Dr. Lowe
- Fred Stoller - Photographer
- Fred Stoller - Bus Driver
- Leigh Bush - Vanessa's Grandmother
- Seth Green - Dog (voice)
- Gustavo Gomez - Mystery Boy
- Kara Crane - Fashion Police #2
- Tara Marie Kirk - Goth Girl
- Miracle Vincent - Fashion Police #1
- Omar Garcia - Lucha Libre Wrestler
- Gerry Katzman - Video Instructor
- Art Alexakis - Mr. Gibson
- Lil J.J. - Morris Adams
- Darnell Suttles - Superintendent
- Darnell Suttles - Superintendant Brown
- Adam Cagley - Lance Widget
- Richard Van Horne - Toby
- Nolan North - Art Dealer
- Nolan North - Simone Moma
- Ulysses Estrada - Paul
- April Gooding - Teacher
- Linda Sans - Yale
- Charles F. FitzSimons - Principle Applicant
- Jesse Heiman - Classmate
- Michelle Kim McCoy - Evelyn Kwong
- Ben Hogestyn - Jock Goldman
- Ben Hogestyn - Jock Goldman (archive footage)
- Judi Barton - Rich Lady with Dog
- Ted Garcia - Anchorperson
- Richard Halpern - Reporter #1
- Patrick Phan - Student
- Patrick Phan - Monster
- Soren Hellerup - The Dutch Coach
- Ellen Albertini Dow - Mrs. Knapp
- Vera R. Taylor - Mrs. Phorchin
- Ivy Malone - Garden Girl #2
- Veronica Sixtos - Girl #3
- Jessica D. Stone - Garden Girl #3
- Aaron Brumfield - Motor
- Adria Dawn - Memory
- Bob Sattler - Vendor
- Emily Alabi - Female Salsa Dancer #3
- Alison Faulk - Female Salsa Dancer #2
- Neva Howell - Alien Abduction Woman
- Gustavo Vargas - Male Salsa Dancer #2
- Kaitlin Wright - Female Salsa Dancer #1
- Olivia Dawn York - Sarah Gothman
- Gregor Collins - Bouncer
- Cindy Escandon - Pretty Girl #2
- Amber Hay - Party Girl
- JJ Snyder - Lovely Assistant
- Michael Swiney - Bouncer
- Lauren Rigau - Lenore
- Mandana Rothschild - Geeky Girl
- Kelli Dawn Hancock - Female Guard
- Kevin M. Horton - Jock #1
- Wesley John - Samurai
- Rome Kanda - Samurai
- Yoshi Tomo Kaneda - Samurai
- Chris Kerner - Museum Guard #3
- Peter Lavin - Boss Thief
- Nathaniel Lee Jr. - Guard #3
- Charles Napier - Seargent Guard
- Charles Shen - Thief #1
- 'Big' LeRoy Mobley - Art Thief
- 'Big' LeRoy Mobley - Thief #2
- Rob Steiner - Handwriting Expert
- Victor Tang - Samurai
- Austin Butler - Zippy Brewster (uncredited)
- Scott Fellows
Don Creech interpreta a Mr. Sweeney en la serie.
Devon Werkheiser interpreta a Ned Bigby en la serie.
Lindsey Shaw interpreta a Jennifer 'Moze' Mosely en la serie.
Daniel Curtis Lee interpreta a Simon 'Cookie' Nelson-Cook en la serie.
Daran Norris hace el papel de Gordy.
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