• 
  Tom Fontana

  regizor

• 
  Milo Ventimiglia

  Richard Thorne III
• 
  Dagmara Dominczyk

  Katrina (2 episodes, 2006)
• 
  Victoria Cartagena

  Zoe Lopez
• 
  Corri English

  Natalie Dykstra
• 
  Matthew Modine

  Profesor Jake Macklin
• 
  Penn Badgley

  Owen Gregory
• 
  Darien Sills-Evans

  Aaron Evans

• 
  Spencer Grammer
• 
  Jason Jurman

  Peter Wortman (4 episodes, 2006)
• 
  Aaron Yoo

  James Fong (6 episodes, 2006)
• 
  Scott Porter

  Jason Miller (2 episodes, 2006)
• 
  Jaime Zevallos

  Riot Spectator (1 episode, 2006)
• 
  Kim Allen

  Raven (1 episode, 2006)
• 
  Geoffrey Cantor

• 
  Peter Gerety

  Dean Harold Harper (3 episodes, 2006)
• 
  Paul Fitzgerald

  Professor Sean Dixon (3 episodes, 2006)
• 
  Krysten Ritter

  Erin Kavenaugh (2 episodes, 2006)
• 
  Julie Lauren

  Mrs. Dixon (1 episode, 2006)
• 
  Khan Baykal

  Beaver (1 episode, 2006)
• 
  Amelia Kallman

  Gina Troeller (4 episodes, 2006)
• 
  Lucia Brawley

  Mrs. Perez (1 episode, 2006)
• 
  Audra McDonald

  Professor Carla Bonatelle  (7 episodes, 2006)
• 
  Greg D'Agostino

  Mean Jock (1 episode, 2006)
• 
  Aasif Mandvi

  Kamil Sharif (6 episodes, 2006)
• 
  Frankie Shaw

  Simone (1 episode, 2006)
• 
  Luis Dalmasy Jr.

  College Student  (1 episode, 2006)
• 
  Steve Antonucci

  Swimmer  (3 episodes, 2006)
• 
  Liza Colón-Zayas

  Dr. Stern (1 episode, 2006)
• 
  James P. Anderson

  Guest Speaker (1 episode, 2006)
• 
  Tiffany Dupont

  Sara Gregory (8 episodes, 2006)
• 
  Franco Bulaon

  Dancing guy #1  (2 episodes, 2006)
• 
  Marcus Collins

  Norris (4 episodes, 2006)
• 
  Pepper Binkley

   April / ... (2 episodes, 2006)
• 
  Emma Bell

   Rachel Fein (5 episodes, 2006)
• 
  Tom Mason

  Richard Thorne II
• 
  Pete Pastore

   Bar Tender (2 episodes, 2006)
• 
  Kristin Rohde

   Annie - Bartender / ... (3 episodes, 2006)
• 
  Denise Quiñones

   Mia Thorne (5 episodes, 2006)
• 
  Ryan Link

   Coffee House Singer / ... (2 episodes, 2006)
• 
  Ernest Waddell

   Lee Hemingway (8 episodes, 2006)
• 
  Rey Valentin

  Chris Hernandez
• 
  Chris Hartl

  Trey Anderson
• 
  Alexander Cendese

   Rylan Garvey (3 episodes, 2006)
• 
  Peter Scanavino

   Gunther Halstead (2 episodes, 2006)
• 
  Genia Morgan

   Student Government Panel Member (2 episodes, 2006)
• 
  Marshall Elliott

  (3 episodes, 2006)
• 
  Jennifer Scott

   Student (6 episodes, 2006)
• 
  Candice Bryant

   Student (3 episodes, 2006)
• 
  Tom Mardirosian

   Thaddeus Cole (2 episodes, 2006)
• 
  Amanda Loncar

   Olive Bettes (3 episodes, 2006)