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