- Carla Gugino
- Â Dr. Molly Anne Caffrey 13 episodes, 2005-2006
- Brian Van Holt
- Â Sean Cavennaugh 13 episodes, 2005-2006
- Brent Spiner
- Â Dr. Nigel Fenway 13 episodes, 2005-2006
- Rob Benedict
- Â Lucas Pegg 13 episodes, 2005-2006
- Peter Dinklage
- Â Arthur Ramsey 13 episodes, 2005-2006
- Charles S. Dutton
- Â J.T. Baylock 13 episodes, 2005-2006
- Matt Sigloch
- Â Agent Rice / ... 4 episodes, 2005-2006
- Mark Berry
- Â Agent Hargrave 4 episodes, 2005-2006
- Scott MacDonald
- Â Captain Manning 4 episodes, 2005-2006
- Diane Venora
- Â Andrea Hatten / ... 4 episodes, 2005
- Maurice Godin
- Â Ed Whitaker 3 episodes, 2005-2006
- Jeff Cockey
- Â Agent Hayes 3 episodes, 2005-2006
- Jake Abel
- Â Brian Janklow 3 episodes, 2005-2006
- Maura Claire Barclay
- Â Carpenter 3 episodes, 2005-2006
- Jon Barton
- Â Marine / ... 3 episodes, 2005
- Julie Dretzin
- Â Libby Drennan 2 episodes, 2005-2006
- William Mapother
- Â Gunneson 2 episodes, 2005
- Seamus Dever
- Â Agent Detoro 2 episodes, 2005
- Kevin Durand
- Â Crewman Sonntag 2 episodes, 2005
- Montae Russell
- Â Agent Harper 2 episodes, 2005-2006
- Jacqueline Kim
- Â Rachel 2 episodes, 2006
- David Hornsby
- Â Roberts 2 episodes, 2005-2006
- Shane Conrad
- Â Thomas Sanford 2 episodes, 2005-2006
- David Gautreaux
- Â Commander Fox 2 episodes, 2005
- Amanda Fuller
- Â Karyn Reynolds 2 episodes, 2005-2006
- Michael Papajohn
- Â Crewman Novak 2 episodes, 2005-2006
- Michael Bentt
- Â Detective / ... 2 episodes, 2005
- R.J. Adams
- Â Detective Nixon 2 episodes, 2005-2006
- Ricardo Chacon
- Â Blue Collar Guy 2 episodes, 2005
- Tatiana Piccone
- Â Chase Martino 1 episode, 2006
- Raphael Sbarge
- Â Richard Tate 1 episode, 2005
- Deborah Strang
- Â Annie Sonntag 1 episode, 2005
- Catherine Bell
- Â Daphne Larson 1 episode, 2006
- Cliff De Young
- Â Charlie Miller 1 episode, 2005
- Leslie Odom Jr.
- Â Sergeant Adams 1 episode, 2006
- Rebecca Marshall
- Â Candy Cane / ... 1 episode, 2006
- Wayne Duvall
- Â Restaurant Owner 1 episode, 2006
- Laurence Mason
- Â Sheriff Fogel 1 episode, 2005
- Denise Dowse
- Â Dr. Margaret Johnson 1 episode, 2005
- Richard Cox
- Â Capt. Hank Mancini 1 episode, 2005
- Stephanie Erb
- Â Caretaker 1 episode, 2006
- James Frain
- Â Reverend Lavory 1 episode, 2005
- Steve Vinovich
- Â Ken Polchek 1 episode, 2005
- Richard V. Licata
- Â Dr. Urbassik 1 episode, 2005
- Chris Butler
- Â Cop 1 episode, 2006
- Mik Scriba
- Â Stripclub Owner 1 episode, 2006
- Steven R. McQueen
- Â Jordan Peters 1 episode, 2005
- Michole Briana White
- Â Cindy 1 episode, 2005
- Jeffrey Donovan
- Â Dr. Julian Sloan 1 episode, 2006
- Austin Majors
- Â Kid 1 episode, 2006
- Carolina Vengoechea
- Â Mrs. Vasquez 1 episode, 2006
- Kathleen M. Darcy
- Â Woman 1 episode, 2005
- Steve Franken
- Â Graham Bolton 1 episode, 2006
- George Gerdes
- Â Mr. Wheeler 1 episode, 2006
- Kelli Jackson
- Â Server 1 episode, 2006
- Elizabeth Berkley
- Â Christine Polchek 1 episode, 2005
- John Douglas Williams
- Â Man 1 episode, 2005
- Joe Sabatino
- Â Team Leader 1 episode, 2005
- Tyler Bosserman
- Â Boy 1 episode, 2005
- Michael Sheriff
- Â Blue Collar Kid 1 episode, 2005
- Matt Corboy
- Â Carl 1 episode, 2006
- Michael Medico
- Â Jason Bolton 1 episode, 2006
- Phoenix Gonzales
- Â Janice 1 episode, 2006
- Christopher May
- Â Patrick Drennan 1 episode, 2005
- Joyce Greenleaf
- Â Secretary 1 episode, 2005
- Robert Pierce
- Â Construction Worker 1 episode, 2006
- David Goryl
- Â Assistant Manager 1 episode, 2005
- Annie Katsura Rollins
- Â Davis 1 episode, 2005
- Chelsey Crisp
- Â Danielle 1 episode, 2006
- Terria Joseph
- Â Woodchipper Woman 1 episode, 2006
- Raphael Verela
- Â Crewman Pena 1 episode, 2006
- Danielle Hartnett
- Â Giggling Woman 1 episode, 2006
- Jeffrey Castillo
- Â Mercenary 1 episode, 2006
- Li Jing
- Â Susan Medrano 1 episode, 2005
- Kevin Alejandro
- Â Marcus 1 episode, 2005
- Cameron Monaghan
- Â Josh Foster 1 episode, 2005
- Viola Davis
- Â Victoria Rossi 1 episode, 2005
- Lauren Tom
- Â Janet Tam 1 episode, 2005
- Erin Cummings
- Â Jen 1 episode, 2005
- Jon Polito
- Â Nicky Frost 1 episode, 2005
- Kevin Kilner
- Â Senator Will Tollman 1 episode, 2005
- Joe Penny
- Â Robert Sprague 1 episode, 2005
- Gonzalo Menendez
- Â Javier Fernandez 1 episode, 2005
- James Parks
- Â Jake Greene 1 episode, 2005
- Christie Lynn Smith
- Â Condo Woman 1 episode, 2005
- Julie Berman
- Â Kristy Foster 1 episode, 2005
- Stephen Lee
- Â Eddie 1 episode, 2005
- Lahmard J. Tate
- Â Ngotho 1 episode, 2005
- Larry Thomas
- Â Norm 1 episode, 2005
- Paula Miranda
- Â Maria 1 episode, 2005
- Robert Wu
- Â Philip Choi 1 episode, 2005
- Adam Chambers
- Â Ryan 1 episode, 2005
- Charles Howerton
- Â Military Official 1 episode, 2005
- Diana Terranova
- Â Dancer 1 episode, 2005
- Larnell Stovall
- Â Tattooed Street Thug 1 episode, 2005
- Philip Pavel
- Â Orderly 1 episode, 2005
- Joel Steingold
- Â Fry 1 episode, 2005
- Tay Blessey
- Â Young Girl 1 episode, 2005
- Jesse Burch
- Â Darryl Brown 1 episode, 2005
- Ewan Chung
- Â Clerk 1 episode, 2005
- Irina Maleeva
- Â Hispanic Woman 1 episode, 2005
- Charles Emmett
- Â Navy Pilot 1 episode, 2005
- Alice Lo
- Â Chinese Woman 1 episode, 2005
- Ronnie Warner
- Â Tazz 1 episode, 2005
- Joel Bryant
- Â Guard #1 1 episode, 2005
- Ammar Daraiseh
- Â Cabbie 1 episode, 2005
- Colin Campbell
- Â Grady 1 episode, 2005
- Traber Burns
- Â Chef 1 episode, 2005
- Elizabeth Liang
- Â Medic 1 episode, 2005
- Josh Cruze
- Â Sec Of Defense 1 episode, 2005
- Mitchell Edmonds
- Â Chief of Naval Operations 1 episode, 2005
- Scott Norris
- Â Seminar Goer 1 episode, 2005
- Herzl Tobey
- Â Screaming Harry 1 episode, 2005
- Melissa Charles
- Â Natalie 1 episode, 2005
- Rob Swanson
- Â Sid Reynolds 1 episode, 2005
- Dotan Baer
- Â Navy Seal #2 1 episode, 2005
- Pete Pastore
- Â Agent Lucci 1 episode, 2005
- Jeremy Forte
- Â Sam Blake 1 episode, 2005
- Raymond T. Williams
- Â Navy Seal #1 1 episode, 2005
- Tanner Richie
- Â Young Tate 1 episode, 2005
- Lucas Ford
- Â Navy Seal #3 1 episode, 2005
- D.J. Evans
- Â Kemper 1 episode, 2005
- Xaypani Baccam
- Â Daniel Park 1 episode, 2005
- Chris Covics
- Â Detective 1 episode, 2005
- TL Savage
- Â Officer Donovan 1 episode, 2005
- Zale Morris
- Â Skittish Man 1 episode, 2005
- Arman Khachikyan
- Â Alien child 1 episode, 2005
- Arthur Santiago
- Â David Arroyo 1 episode, 2005
- Blaine Saunders
- Â Daughter 1 episode, 2006
- Mike Caravella
- Â Non Infected Victim 1 episode, 2006
- Shane Wood
- Â Alien 1 episode, 2006
- Mike Mobley
- Â Partygoer 1 episode, 2006
- Richard Lawrence
- Â Restaurant Manager 1 episode, 2006
- James McMann
- Â Patient 1 episode, 2006
- Shalondra Henry
- Â Billings 1 episode, 2006
- Andre Johnson
- Â FBI Agent (uncredited) 2 episodes, 2005
- Barry Ratcliffe
- Â Officer Morris (uncredited) 1 episode, 2005
- Andrea Nittoli
- Â Woman in Bed (uncredited) 1 episode, 2005
- Joe Duffy
- Â Humans under Alien Trance (uncredited) 1 episode, 2005
- Richard Kreps
- Â FBI Agent (uncredited) 1 episode, 2005
- Jillian Difusco
- Â Dancer (uncredited) 1 episode, 2005
- Rebecca Parisi
- Â Bat-Winged Rave Girl (uncredited) 1 episode, 2005
- Jon Liggett
- Â Secret Agent (uncredited) 1 episode, 2005
- Melody Shere'a
- Â Medical Tech (uncredited) 1 episode, 2005
- Timothy L. Raynor
- Â Darga (uncredited) 1 episode, 2006
- Brad Newman
- Â Panicky Businessman (uncredited) 1 episode, 2006
- Kate Clarke
- Â Nurse (uncredited) 1 episode, 2006
- Chelsea Bond
- Â Misty (uncredited) 1 episode, 2006
- Mathew Lorenceau
- Â Shirtless Alien (uncredited) 1 episode, 2006
- Tony Flores
- Â Mercenary (uncredited) 1 episode, 2006