Gregory Phillip "Greg" Grunberg (born July 11, 1966) is an American television actor. He is best known from starring as Matt Parkman on the NBC television series Heroes. Other notable roles included the characters Sean Blumberg on Felicity (1998–2002) and Eric Weiss on Alias (2001–2006), both created and produced by childhood friend J. J. Abrams.
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Detective Mark McDaniels
Tom Patterson
Bad Robot Security Guard (voice)
Ronald Neuberger
Jeff Morrison
Len Bryant
Chris Callahan
Bjorn (voice)
Self - Restaurant Patron
Seth Norris
Agent Bill Pearson
Jay Gianukos
Jack Leverett
Self
Self
Brad Carver
Loeb
Greg Wetzel
Matt Parkman
George
Gatman
Mikey
Ray Wheeler
Sean Blumberg
Sean Blumberg (voice) (uncredited)
Frankie Cantrell
Gene Moretti
Scott Rhinehart
Kevin
Snap Wexley
Samaritan Driver (uncredited)
Dale Locklin
Nick
Bernie Fein
Kurt Baronson
Snap Wexley
Shirtless Fan 'T'
Andersen
Carter Abbey
Joe (voice)
Stepdad (voice)
Phil (Jack's Driver)
TV Commercial Director
Brett
Matt Parkman
Commander Finnegan
Himself
Four Seasons Hotel Security
Steel Maxum (voice)
Self
Eric Weiss
Date #1 (uncredited)
Scott Paterno
Double Date Guy
Alex Mathis
Self
An Abernathy Cousin
Sitcom Actor
Jerry
Dr. Gutheridge
Judd
Moore
Self
Detective Garces
Rudy's Assistant - Sean Nusbalm
Self
Bruce
Limo Driver
Self
Alex Mathis
Detective Paul Jackson
Detective Arden
Abbott
Nick Case
Best Man
Dr. Wagner
Owen Stokes
Michael
Dr. Cooper
Barry
Detective Davis
Darren
Eugene Wylder
Wilke - New Jersey Informant
Smythe
Hal Harrington
Steve
Himself
James
Mark Calzonetti
Evan
Odin (voice)
Bob
Self
Manager
Principal
911 Operator
Self - Guest
Self
Self - Host