
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.
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In the Name of the Father
1993 · as Paddy Armstrong

Mysterious Island
2012 · as Young Captain Nemo

Exes
2025 · as Senior Investigator Gary

Unstoppable
2004 · as Leitch

Xtinction: Predator X
2010 · as Dr. Charles LeBlanc

Lover's Knot
1996 · as Nigel Bowles

Megalodon
2004 · as Mitchell Parks

Nether World
1998 · as California

New Alcatraz
2001 · as Yuri

Lost Voyage
2001 · as Ian Fields

Broken
2007 · as Malcolm

Deep Shock
2003 · as Chomsky

Lady in the Box
2001

Out of the Cold
1999 · as Fang

Sons of Liberty
2013 · as Ackley

Ever After
as The Ringmaster

Doctor Who Explained
2013 · as Self

Farewell, My Love
2000 · as M. J.