Alexander Harper Berkeley (born December 16, 1955) is an American actor. He is known for his television roles as Sheriff Thomas McAllister on the crime drama The Mentalist, George Mason on the political thriller series 24, Percy Rose on the action thriller series Nikita, the Man on The Booth At The End and Gregory in AMC's The Walking Dead. His notable film roles include Todd Voight in Terminator 2: Judgment Day, Agent Gibbs in Air Force One, Bowery Snax in Sid and Nancy, Dr. Lamar in Gattaca, Trevor Lyle in Candyman and Ralph in Heat.
as Seymour
as Father
as Skip
as William
as Harris
as Blackburn
as Self
as Frank Lloyd Wright (voice)
as George Schultz
as Gilad Pellaeon (voice)(1 ep)
as Maynard
as Gordon
as Charlie Hoge
as Joel
as Oliver
as Michael Rand
as Self - Guest(2 eps)
as Priest
as Maurice Hewitt(1 ep)
as Lee Hackman(7 eps)
as Gilad Pellaeon(1 ep)
as Priest James
as Mario Castelnuovo-Tedesco
as Edwards
as Uncle
as Dr. Roberts
as Mr. Milk
as General John Acosta(1 ep)
as Judge Hollingsworth(1 ep)
as Artemis
as Phillip
as Peter Lockwood(1 ep)
as Mr. Ellis
as Ronnie 'Dogstick' Brannigan(4 eps)
as Forrest Bobo
as Jonathan Foster(3 eps)
as Dr. Kirk Langstrom (voice)
as Frank Devore
as Magistrat Hale(13 eps)
as Chick
as Dr. Thomas Casey
as Gordon Shafer
as Uncle Jeff
as Kenneth
as Dr. Lansen
as Manhunter / Paul Kirk (voice)(1 ep)
as Jeremiah Rains(2 eps)
as Peter Keller
as Peter
as H1ghway_man
as Lieutenant Durgan
as Theodore Dent(1 ep)
as The Man(10 eps)
as Moe
as Liam McClean(5 eps)
as Liam McLean(3 eps)
as Detective Carter
as Sergeant Mallory
as Gregory(15 eps)
as Percy Rose(45 eps)
as McMahon
as Warden Morgg / Trukk (voice)(1 ep)
as Detective Gigante
as Charles Monroe(2 eps)
as Harry
as Mr. Frost
as Captain Atom (voice)
as Father De La Chasse
as King
as Sonny
as Dad
as Sid Harris
as Fred O'Brien
as Sinestro (voice)(1 ep)
as Sheriff Thomas McAllister(5 eps)
as Stuart St. John
as Judge Moran
as Railroad Foreman
as Doc Ruppert
as John Smith (uncredited)(1 ep)
as John Smith (voice)(1 ep)
as Uncle Doug
as Peter Shepherd
as Det. Hyde(1 ep)
as Dr. Bancroft(1 ep)
as Detective Curt Landry(1 ep)
as Gus
as Harkness
as Arlen Pavich
as Mitchell Slocombe(1 ep)
as Jonathan
as Self(5 eps)
as A.D.A. Rex Swarthmore(1 ep)
as Paul (voice)(1 ep)
as Admiral Kentz
as Tommy Tulip
as Alvin Simmons(1 ep)
as Mento / General Immortus (voice)(2 eps)
as Warp (voice)(1 ep)
as Joey Patterson
as Harry Kellogg(1 ep)
as Keith Nolan(3 eps)
as Mr. DeMarco
as General Brak / Soldier (voice)(1 ep)
as General Brak / Dignitary / Soldier (voice)(1 ep)
as George Mason(27 eps)
as George Pagolis(1 ep)
as Virgil Koster
as Clay Shelton(1 ep)
as Dakar Johnston
as Rory Atwater(5 eps)
as Nathan Van Cleef
as Evan Wantz
as Franklin Hollis(1 ep)
as Dr. Dylan Cotner
as Bo Tyler
as Bo Tyler(2 eps)
as Dr. Childes (voice)(2 eps)
as Yepihodov
as Gavreau
as Lt. Clyde Webber
as Barking Deer #2 (voice)(1 ep)
as Stoat (voice)(1 ep)
as J.D. Johnson
as George
as Male Interviewer (voice)
as Hammond
as Charlie's Friend
as Additional Voices (voice)(1 ep)
as Agent Gibbs
as Dr. Lamar
as Danny “Figaretto” Evans
as Tosh
as Buzz Aldrin
as Date #4 (uncredited)
as John Barrows
as Gentry
as Sgt. Corey Mills (voice)(1 ep)
as Jimbo(1 ep)
as Ryan
as Lonner (uncredited)
as Alexander Willis
as Donald Falk
as Sunburned Man
as Neil Wojak(1 ep)
as Curtis Harrison
as Ralph
as Cynical Cabbie
as Christophe Nnngaarzh(1 ep)
as Henry Hurt
as Greg
as Pro Shop Cashier (voice)(1 ep)
as Terry McCammon(1 ep)
as Shakespeare
as Iago (Voice)(1 ep)
as Coldsteel (Voice)(1 ep)
as Second Man
as Detective Wilson(1 ep)
as Octopaganini (voice)(1 ep)
as Dr Carl Weschler(1 ep)
as Sherman Carson
as Hans (voice)(1 ep)
as Joey Szabo
as Russ Loring
as Dr. Hodge(1 ep)
as Brett Bones(1 ep)
as Bernard(1 ep)
as James Blakemore
as Capt. Whitaker
as Kozolowski
as Trevor Lyle
as Marchat
as Peter Zenner
as Harold
as Roberts, Vietnam
as Harvey Preston
as Todd Voight
as Wayne
as Bruce MacNamara
as Harry Copeland
as Blackwell
as Dr. Landru(3 eps)
as Clay Pollack(1 ep)
as Lt. Pierson
as Stark
as Detective
as Fast Eddie
as John Patrick Earl
as Monty Griswold
as Jeffrey(1 ep)
as Rudy Mohr
as Lloyd
as Waingro
as Jack Torme
as Ricky Fell
as Cardogan
as Ez Andy
as Byron Cole
as Ray Spiotta(1 ep)
as Preacher McMahon
as Yo-Yo
as Bowery Snax
as (segment "Take My Life...Please!")(1 ep)
as Kent Sutcliffe
as Scalper(1 ep)
as Tommy Lowell(2 eps)
as Taxi Driver(1 ep)
as Baker(1 ep)
as Sergeant Wilson(1 ep)
as Dan Kowalski(1 ep)
as Eric Fromby(1 ep)
as Connally
as Maurice(1 ep)
as Buzz Whitehead(1 ep)
as Christopher Crawford
as Christopher Hawks(1 ep)
as Tom(1 ep)
as Marine(1 ep)