Patrick Dempsey

as Angelo Doyle(10 eps)

as Self

as Aaron Spencer(10 eps)

as Piero Taruffi

as Sheriff Eric Newlon

as Self

as Self

as Robert Philip

as Self(1 ep)

as Self

as Tom Quincy(1 ep)

as Dominic Morgan(18 eps)

as Self

as Harry Quebert(10 eps)

as (US version)

as Jack

as Self(1 ep)

as Self

as Self

as Self

as Self(1 ep)

as Self - Guest(1 ep)

as Self(4 eps)

as Self

as Self(2 eps)

as Tripp

as Dylan

as Narrator (voice)

as Harrison Copeland

as Tom

as Robert Philip

as Dr. Derek Shepherd(2 eps)

as Scott Casey

as Self - Host

as Self - Guest(1 ep)

as Kenai (voice)

as Self(1 ep)

as Derek Shepherd(243 eps)

as Self - Guest(1 ep)

as Ben Weissman

as Self(3 eps)

as Peter Connor

as Self(2 eps)

as Self - Guest(2 eps)

as Older Louis Masoudi

as Self(1 ep)

as Andrew Hennings

as Cass(2 eps)

as Mark Kincaid

as Fast Eddie

as Patrick Dempsey (voice)(1 ep)

as (voice)(1 ep)

as Jeremiah

as The Stranger

as Rodya Raskolnikov

as Matthew(3 eps)

as Mike

as Sam

as Clayton

as Jeffrey

as Floyd Gaylen

as Self(1 ep)

as Pierre Arronax(2 eps)

as Paul Stewart(3 eps)

as Self(1 ep)

as Harrison Burns(2 eps)

as Tom Harris

as Tom

as Jimbo Scott

as Everett Calloway

as Billy

as John F. Kennedy(2 eps)

as Charlie Hunter

as Robert Faldo

as Self(1 ep)

as Meyer Lansky

as James(1 ep)

as Charlie Farrow

as Robert 'Bobby' Libner

as The Plant(1 ep)

as Chris Wooden

as Randy Bodek

as Michael

as Self - Guest(3 eps)

as Potter Daventry

as Ellsworth "Sonny" Wisecarver

as Ronald Miller

as Rudy

as Kellin Taylor

as Mike Damone(7 eps)

as Underground Stuff Buyer (uncredited)

as Corbet

as Self(1 ep)

as Potter Daventry(1 ep)

as Self(1 ep)