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Mark Ross Pellegrino (born April 9, 1965) is an American actor of film and television. He is best known for his work on Lost and Supernatural.

Beverly Hills Cop: Axel F
as Beck

Underdeveloped
as Nader

Class of '09
as Mark Tupirik

The Last Thing He Told Me
as Wallace

The Rookie: Feds
as Victor Quincannon

American Rust
as Virgil Poe

Beirut
as Cal Riley

9-1-1
as Mitchell Trent

13 Reasons Why
as Bill Standall

Quantico
as Clayton Haas

The Returned
as Jack Winship

Lennon or McCartney
as Self

Bad Turn Worse
as Giff

The Trials of Cate McCall
as Detective Welch

The Tomorrow People
as Dr. Jedikiah Price
Delivering the Goods
as Mr. Quentin

Revolution
as Jeremy Baker

Hemingway & Gellhorn
as Max Eastman

Bad Meat
as Doug Kendrew

Grimm
as Jarold Kempfer

Person of Interest
as Daniel Drake

Joint Body
as Nick Burke

Blood Meridian Test Reel
as Judge Holden

Being Human
as James Bishop

Locke & Key
as Rendell Locke

Disappearing in America
as Bodyguard

The Philanthropist
as Walter Kerabatsos

2:13
as John Tyler

Castle
as Tom Dempsey / Tom Dempsey III

Fear Itself: The Spirit Box
as Mr. Drake

An American Affair
as Graham Caswell

The Mentalist
as Von McBride

Fear Itself
as Mr. Drake

Women's Murder Club

Chuck
as Fulcrum agent

Burn Notice
as Quentin King

The Number 23
as Kyle Finch

Dexter
as Paul Bennett

Caffeine
as Tom

The Unit
as Gary Soto

Ellie Parker
as Justin

Capote
as Dick Hickock

Ghost Whisperer
as Ben Tillman / Joseph Webb

Criminal Minds
as Lt. Evans

Supernatural
as Lucifer

Prison Break
as Patrick Vikan

The Closer
as Gavin Q. Baker III

Grey's Anatomy
as Chris

Numb3rs
as Tim Hamer

National Treasure
as Agent Johnson

Lost
as Jacob
NYPD 2069
as Phil Pavelka

Spartan
as Convict

Twisted
as Jimmy Schmidt

Moving Alan
as Alan Kennard

The Hunted
as Dale Hewitt

Without a Trace
as Sadik Marku

CSI: Miami
as Jed Gold

Ronnie
as Keith Schwann

Crossing Jordan
as Keith Walker