Walter O'Brien
Elyes Gabel
Agent Cabe Gallo
Robert Patrick
Happy Quinn
Jadyn Wong
Paige Dineen
Katharine McPhee
Toby Curtis
Eddie Kaye Thomas
Sylvester Dodd
Ari Stidham
Ralph
Riley B. Smith*
Renee Connelly
Alicia Lagano
Guest Star
Fernanda Andrade
Richard Elia
Andy Buckley
Rebecca Burns
Jessica Tuck
Drew / Drew Dineen
Brendan Hines
Ralph Dineen
Riley B. Smith
Guest Star
Scott MacDonald
Guest Star
Corbin Bernsen
Mark Collins
Joshua Leonard
Governor Paul Lane
Joel Gretsch
Guest Star
John Posey
Sima
Nazneen Contractor
Director Merrick / Merrick
David Fabrizio
Megan O'Brien
Camille Guaty
Slavomir
Zoran Korach
LT James Corbin
Jake McLaughlin
Sean O'Brien / Farmer / Walter's Father
Glenn Keogh
Guest Star
Ginger Gonzaga
Nate
Octavius J. Johnson
Guest Star
Christina Llorens
Guest Star
Rick Ravanello
Patrick Quinn
Jamie McShane
Farmer Wife/Walter's Mother
Carla Toutz
Guest Star
Aramis Knight
Hetty Lange
Linda Hunt
Leonard
Mackenzie Astin
General Ned Walker
Mykelti Williamson
Tim Armstrong
Scott Porter
Guest Star
Matt Lasky
Guest Star
William Morse
Guest Star
José Zúñiga
Luke
Kamal Jones
Agent Thomas Keeler
Glenn Plummer
Agent Miller
James Black
Guest Star
Aaron Bledsoe
Guest Star
Timothy V. Murphy
Wilson Eckherd
Spencer Garrett
Guest Star
Robert Mitchell
Guest Star
Carlos Sanz
Team Leader
Jack Guzman
Guest Star
Jason Manuel Olazábal
Dr. Cassandra Davis
Shohreh Aghdashloo
Guest Star
Sunkrish Bala
Simon
Jason Hastings
Agent Simone Taylor
Karolina Wydra
Florence
Tina Majorino
Guest Star
Mia Serafino
Owen
Wyatt Oleff
Bruce
David James Elliott
Guest Star
Chris Mulkey
Guest Star
Leigh-Ann Rose
Darby
Orestes Arcuni
Detective Jim Archer
Lochlyn Munro
Beach Girl
Julia Kelly
Guest Star
Anthony Hill
Dan Heather
Charles Malik Whitfield
Guest Star
Patrick Fabian
Guest Star
Javier Calderon
Guest Star
Ryan Sands
Ray Spiewack
Kevin Weisman
Guest Star
Kevin Fry-Bowers
Agent Khara
Navid Negahban
Terrorist Marine
Steven Allerick
Guest Star
Keong Sim
Warden
Keith David
Curator Paulson
Raphael Sbarge
Peyton Temple
Scott Mescudi
Javier Barrios
Ace Marrero
Javier
Christian Ochoa
Young Walter O'Brien
Daniel Zolghadri
Agent Marchand
Jennifer Lee
Guest Star
Michael Wiseman
Game Rep
Georgie Guinane
Tac Team Leader
Jonathan S. Grady
Guest Star
Jay Sincere
Guest Star
Alexander Chaplin
Lucky the King
Cliff "Method Man" Smith
Guest Star
Chad Todhunter
Guest Star
Derrick McMillon
Guest Star
Eric Davis
Guest Star
Michael Christian Alexander
Guest Star
Jen Kuhn
Andre
Jimmy Roberts
Guest Star
Chris Yule
Mr. Creevy
Stuart McLean
Guest Star
Pilar Holland
Guest Star
Vedette Lim
Calvin
Lawrence Kao
14-Year-Old Peg
Emily Robinson
Gostin
John Burke
Bomb Squad Sergeant
Joseph Baird
Guest Star
Nick Gracer
Special Agent Elise Carey
Amber Friendly
Max
Devon Chandler Long
Guest Star
Omid Zader
Allie Jones
Reiko Aylesworth
Guest Star
David An
Guest Star
Taylor Keene
Guest Star
Roy Abramsohn
Guest Star
Michael Cornacchia
Guest Star
Sandra Cevallos-Campanella
Doctor
Thai Douglas
Guest Star
Richard Pierre-Louis
Officer Draper
Gary Kraus
Dustin McBride
Con Schell
Jules
Melissa Stubbs
Museum Guard
Lissa Pallo
Guest Star
Omar Leyva
Flatbed Driver
Joe Lorenzo
Igor
Michael Klesic
Jonah
Andy Tran
Guest Star
Vladimir Tevlovski
Bartender
Jake Matthews
Guest Star
Jake Lockett
Janice Keller
Kelley Jakle
Biker
Scott Engrotti
Guest Star
Keith Andreen
Patty Logan
Nikki Castillo
Guest Star
Christopher Carroll
Guest Star
Rick Garcia
Nemos
Anthony Skordi
Guest Star
Katherine Kamhi
Dirty John Tucker
Ronnie Gene Blevins
Agent Cullens
Ted Mattison
Owen Sugar
Matt Gerald
Guest Star
Aaron Braxton
Guest Star
Virginia Montero
Percy Tate
Rocky Marquette
Jed Hausler
Bryan Krasner
Maintenance Guy
Michael Boucher
Guest Star
Moniques Barajas
Rosa Barrios
Christine Garver
Guest Star
Vanessa Chester
Guest Star
Stevie Nelson
Guest Star
Wilson Ramirez
Reporter
Nicola Lambo
Phil Daniels
Josh Keaton
Guest Star
Reginald James
Newscaster
Gina St. John
Supervisor Elkins
Josh Clark
Guest Star
Jay Giannone
Guest Star
Grinnell Morris
Henchman
Jamal Duff
Guest Star
Eddie Perez
Anthony Cole
Anthony Molinari
Guest Star
Fernando Rivera
Owen's Mom
Danielle Hoetmer
Guest Star
Victor Kelso
Robert Richter
Erick Avari
Capt. James Pike
Patrick St. Esprit
Guest Star
Dominique Razón
Guest Star
Stevin Knight
Mansion Guard
Daniel Phai
Guest Star
Sasha Goldberg
15 Year-Old Sylvester
Eric Osovsky
Guest Star
Charlie Heydt
Guest Star
Michael Filipowich
Startled Driver
Austin Priester
Surgeon
Leith Burke
Guest Star
Carl McDowell
Guest Star
Aaron Krebs
Officer Brown
Michael Sun Lee
Brooks
Ernie Hudson
Richter's Assistant
Emma Fassler
Jerry Dowdell
Justin Rupple
Jacques Labeaux
Mike Powers
General Talbertse
Peter Jason
Guest Star
Heather McPhaul
Doctor
Brian Glanney
Guest Star
Jonathan Erickson Eisley
Co-Pilot
Alimi Ballard
Doctor
Kristen Ariza
Mrs. Mueller
Gisela Kovach
Sean O'Brien
Glenn Keough
Guest Star
Chad Davis
Guard Rivas
J. Doc Farrow
Foreman
Frank Crim
Guest Star
Catherine Kamei
Guest Star
Chad Guerrero
Guest Star
Carol Herman
Teenage Walter
Robert Smythe
Dyfrost
Daniel Dratch
Gordon Tooley
David Burr
Swat Leader
Brennan Feonix
Kiosk Operator
Rajan Velu
Floor Manager
Jeffrey A. Baker
Guest Star
Andy McDermott
Randy
Jake Regal
Randy
Jake Regal
Kaldor / Glenn / Kaldor (Glenn)
John Hartmann
Nun
Silvia McClure
Gordon Tooley
David Burr
Forensic
Nikhil Shukla
Guest Star
Joshua Shibata
Vasquez
Joe Ordaz
Guest Star
Craig Tsuyumine
Agent Bates
Desean Terry
Guest Star
Hal Devi
Guest Star
Sean Patrick Murphy
Guest Star
Julie Lancaster
Therapist
Diahnna Nicole Baxter
Partner
Collin Hymes
Guest Star
Brian Konowal
Guest Star
Andres Perez-Molina
Tower Chief
Martin Thompson
Katherine Cooper
Peri Gilpin
Sara
Ruby Roth
Mrs. Lane
Kate Butler
Guest Star
Casey Adams
Guest Star
Celeste Creel
Guest Star
Angela K. Thomas
Hospital Security Guard
John Barbolla
Vlaxco Employee
Elizabeth Del Rosario
Jeep Driver
Lynnita Ellis
Director
Milan Cheylov
Director
Justin Lin*
Director
Mel Damski
Director
Guy Ferland
Director
Jeff Thomas
Director
Justin Lin
Director
Matt Earl Beesley
Director
David Grossman
Director
Jeffrey G. Hunt
Director
Jann Turner
Director
Sam Hill
Director
Gary Fleder
Director
Jace Alexander
Director
Kevin Hooks
Director
Jerry Levine
Director
Dwight Little
Director
Bobby Roth