Mark Andreas Sheppard (born 30 May 1964) is a British actor and musician. He is often credited as Mark A. Sheppard. Sheppard is known for playing the demon/King of Hell Crowley on Supernatural and for his recurring roles as lawyer Romo Lampkin on the Battlestar Galactica reboot, Interpol investigator James Sterling on Leverage, and small-time crime lord Badger on Joss Whedon's Firefly. Description above from the Wikipedia article Mark Sheppard, licensed under CC-BY-SA, full list of contributors on Wikipedia.
as Hagan
as Willoughby Kipling
as Fake Dr. Zito
as Self
as Ackley
as Young Captain Nemo
as Dr. Charles LeBlanc
as Curtis Hagen
as Benedict Valda
as Tanaka
as Jim Sterling
as Manservant Neville
as Malcolm
as Ring Director
as Tom Prescott
as Crowley
as Canton Delaware
as Charles Walker
as Leitch
as Peter
as Mitchell Parks
as Romo Lampkin
as Chomsky
as Young Mr. Pain (uncredited)
as Yuri
as Johnny Patani
as Badger
as Ronan Dennehy
as Chris Downey
as Ian Fields
as Ivan Erwich
as The Chameleon
as M. J.
as Rod Darling
as Dimitri Sadesky
as Yuri Gregorov
as Fang
as Christopher 'C.J.' Yates
as Arnon
as Nero
as CJ Yates
as Nigel Bowles
as Jack
as Leucon
as Paddy Armstrong
as Bob the Caretaker / Cecil L'Ively
as Eric
as Third Assistant Director
as Director