- Dan Woods - Principal Daniel Raditch
- Justin Kelly - Jake Martin
- Paula Brancati - Jane Vaughn
- Dylan Everett - Campbell 'Cam' Saunders
- Raymond Ablack - Sav Bhandari
- Nina Dobrev - Mia Jones
- Spencer Van Wyck - Wesley Betenkamp
- Cassie Steele - Manny Santos
- Landon Liboiron - Declan Coyne
- Chloe Rose - Katie Matlin
- Pat Mastroianni - Joey Jeremiah
- Stacie Mistysyn - Caitlin Ryan
- Sarah Barrable-Tishauer - Liberty Van Zandt
- Daniel Clark - Sean Cameron
- Jake Goldsbie - Toby Isaacs
- Amanda Stepto - Christine Nelson
- Shenae Grimes-Beech - Darcy Edwards
- Melissa DiMarco - Principal Daphne Hatzilakos
- Mike Lobel - Jay Hogart
- Mazin Elsadig - Damien Hayes
- Stacey Farber - Ellie Nash
- Evan Williams - Kelly Ashoona
- Adamo Ruggiero - Marco Del Rossi
- Natty Zavitz - Bruce the Moose
- Scott Paterson - Johnny DiMarco
- Jajube Mandiela - Chantay Black
- Aislinn Paul - Clare Edwards
- Samantha Munro - Anya MacPherson
- Annie Clark - Fiona Coyne
- Argiris Karras - Riley Stavros
- Shannon Kook - Zane Park
- Jahmil French - Dave Turner
- Jordan Todosey - Adam Torres
- Daniel Kelly - Owen Milligan
- A.J. Saudin - Connor DeLaurier
- Sam Earle - K.C. Guthrie
- Shanice Banton - Marisol Lewis
- Demetrius Joyette - Michael 'Mike' Dallas
- Cristine Prosperi - Imogen Moreno
- Luke Bilyk - Drew Torres
- Jessica Tyler - Jenna Middleton
- Sarah Fisher - Rebecca 'Becky' Baker
- Ana Golja - Zoë Rivas
- Lyle Lettau - Tristan Milligan
- Munro Chambers - Eli Goldsworthy
- Alicia Dea Josipovic - Bianca DeSousa
- Melinda Shankar - Alli Bhandari
- Nikki Gould - Grace Cardinal
- Craig Arnold - Lucas 'Luke' Baker
- Cory Lee - Ms. Oh
- Stefan Brogren - Archie Simpson
- Amanda Arcuri - Lola Pacini
- Reiya Downs - Shay Powers
- Ricardo Hoyos - Zig Novak
- André Dae Kim - Winston Chu
- Spencer MacPherson - Hunter Hollingsworth
- Eric Osborne - Miles Hollingsworth III
- Olivia Scriven - Maya Matlin
- Sara Waisglass - Frankie Hollingsworth
- Richard Walters - Tiny Bell
- Jacob Neayem - Mohammed 'Mo' Mashkour
- Jake Epstein - Craig Manning
- Dalmar Abuzeid - Danny Van Zandt
- Melissa McIntyre - Ashley Kerwin
- Marc Donato - Derek Haig
- Deanna Casaluce - Alex Nuñez
- Alex Steele - Tori Santamaria
- Alex Steele - Angela Jeremiah
- Anthony Christian Potenza - Cashier
- Barbara Mamabolo - Older Girl at Party
- Marc Minardi - Lucas Valieri
- Sean O'Neill - Robson
- Keke Palmer - Keke Palmer
- Ruth Marshall - Helen Edwards
- Devon Bostick - Nic
- Genelle Williams - Carla Carlisle
- Nathan Stephenson - Griffin
- Von Flores - Mr. Joseph Santos
- Kate Todd - Natasha
- Natasha Bedingfield - Herself
- Jason Mewes - Jason Mewes
- Maria Vacratsis - Sheila
- Linlyn Lue - Ms. Laura Kwan
- Terra Vnesa - Trina
- Kit Weyman - Sulley
- John Bregar - Dylan Michalchuk
- Michael Kinney - Darryl Armstrong
- Katie Lai - Kendra Mason
- Al Mukaddam - Mohammed
- Alanis Morissette - Self
- Benjamin Hollingsworth - Devon
- Morgan Kelly - Skinny
- Philip Nozuka - Chester Hosoda
- Joe Pingue - Tony
- Hugh Dillon - Albert Manning
- Billy Ray Cyrus - Duke
- Kevin Smith - Kevin Smith
- Shirley Douglas - Professor Dunwoody
- Ephraim Ellis - Rick Murray
- Roger Dunn - Mr. Morton
- Anais Granofsky - Lucy
- Jennifer Podemski - Ms. Chantel Sauvé
- David Orth - Christopher
- Neil Hope - Derek 'Wheels' Wheeler (Uncredited)
- Elisa Moolecherry - Sydney
- Rebecca Haines - Kathleen Mead (Uncredited)
- Maria Ricossa - Kate Kerwin
- Don McKellar - Keith
- Siluck Saysanasy - Yick Yu (Uncredited)
- Mark Wilson - The Landlord
- Stephen Amell - Doorman
- Kyle Mac - Frat Guy #2
- Ishan Davé - Linus
- Devyn Nekoda - Arlene Takahashi
- Paul Popowich - Asher Shostak
- Meghan Heffern - Summer
- Brooke Johnson - Professeur Janes
- Graham Abbey - Glenn Martin
- Vanessa Morgan - Vanessa
- Jordan Chan - Lily
- Jonas Chernick - Mr. Betenkamp
- Riley Gilchrist - Dr. Christopoulos
- Peter Tufford Kennedy - Bullfrog Goldsworthy
- Paul Sun-Hyung Lee - Juan Tong
- Greta Onieogou - Sirina
- Christopher Jacot - Matt Oleander
- Athena Karkanis - Rachel
- Joanne Vannicola - Chef Kaz
- Ted Atherton - Randall Edwards
- Daniel Kash - Mr. Stavros
- Kevin Hanchard - Pest Control Manager
- Lara Jean Chorostecki - Molly
- Shauna MacDonald - Mrs. Novak
- Zoie Palmer - Officer
- Nigel Hamer - Toby's father
- Ho Chow - Policeman
- Sara Holmes - Alison
- Darrin Brown - Dwayne Myers (Uncredited)
- Michael Carry - Simon Dexter (Uncredited)
- Irene Courakos - Alexa Pappadopolos (Uncredited)
- Lisa Berry - Theatre Manager
- Melanie Scrofano - Meredith Fox
- Debra McGrath - NYU interviewer (as Deb McGrath)
- Sydney Ozerov-Meyer - Paula
- Janet Porter - Dr. Sandler
- Kyra Azzopardi - Trish
- Sarah Mennell - Detective Robbins
- Chris Anton - Sammy
- Zach Smadu - Randy
- Claire Rankin - Mrs. Jones
- Tamina Pollack-Paris - Lucy
- Judy Marshak - Grandma Baker
- Rene Lemieux - Grand-Père de Leo
- Andrew Priestman - Greg
- Nico Racicot - Andre
- Marc-Anthony Sarria - Oliver
- Anthony Gerbrandt - Fiona's Attacker
- Louis Paquette - Thief
- Jill Frappier - Grand-Mère de Leo
- Samantha Helt - Christie
- Karen Andrew - Liz
- Tynomi Banks - Drag Queen
- Shaun Shetty - Steve Patel
- Susanne Sutchy - Juliana Santoro
- Kate Lynch - Dr. Frank
- Samantha Brown - Heidi
- Lamar Johnson - Niner
- Jessica Clement - Naomi
- Kathryn Kriitmaa - Lieutenant Stedman
- Grisha Pasternak - Ron-Ron
- Maggie Cassella - Counsellor
- Amanda Joy - Kayla
- Tony Craig - Lawyer
- Brenda Kamino - Judge
- Karl Campbell - Bodyguard
- Elias Edraki - Anson
- Will Bowes - Thomas
- Ellora Patnaik - Nurse
- Greg Ellwand - Eamonn Grundy
- Jason Gosbee - Roman
- Shay Mitchell - Model
- Marcia Johnson - Dr. Yablonsky
- A.K. Shand - Katie
- Landon Norris - Aron DiMarco
- Tracy Shreve - Mrs. Turner
- Malcolm Xerxes - Dr. MacKay
- Barbara Radecki - Mrs. Saunders
- Rishma Malik Scott - Mrs. Ameena Hassan
- Krysta Carter - TV Star Lo
- Tangara Jones - Julie
- Indiana Jagait - Mr. Hassan
- Fraser Young - Lederhöser
- Kim Bourne - Carolyn
- Laura Miyata - Lindsay
- Ursula Campbell - Missy
- Brian Bisson - Stripper Chef
- Mishu Vellani - Mrs. Bhandari
- Marvin Ishmael - Mr. Bhandari
- Joy Tanner - Mrs. Laura Coyne
- Ramona Milano - Audra Torres
- Niamh Wilson - Jack Jones
- Steve Belford - Jesse Stefanovic
- Valerie Buhagiar - Mrs. Stavros
- Flossie McKnight - LoveQueen16
- Tyler Stentiford - Liam Berish
- Jayne Heitmeyer - Toni Stark
- Chaz Bono - Chaz
- Debra Felstead - Officer
Aislinn Paul hace el papel de Clare Edwards.
A.J. Saudin interpreta a Connor DeLaurier en la serie.
Demetrius Joyette interpreta a Michael 'Mike' Dallas en la serie.
Cristine Prosperi interpreta a Imogen Moreno en la serie.
Luke Bilyk interpreta a Drew Torres en la serie.
Sarah Fisher interpreta a Rebecca 'Becky' Baker en la serie.
Ana Golja hace el papel de Zoë Rivas.
Lyle Lettau interpreta a Tristan Milligan en la serie.
Munro Chambers interpreta a Eli Goldsworthy en la serie.
Melinda Shankar hace el papel de Alli Bhandari.
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