Mark Sheppard

Mark Andreas Sheppard is a British-American actor and musician. He is often credited as "Mark A. Sheppard". Sheppard is known for his recurring roles as the demon/King of Hell Crowley on Supernatural, 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.

White Collar · S5, E1

At What Price

With Peter in prison facing murder charges and every shred of evidence pointing to him for Senator Pratt’s untimely death, Neal must strike a deal with the devil to help try and clear Peter’s name. Nothing is off limits, even if it means owing a major debt.
White Collar · S5, E3

One Last Stakeout

As Peter settles into a promoted position at the FBI, Neal has to pull off a brazen museum heist right underneath the FBI’s nose.
White Collar · S5, E8

Digging Deeper

Neal and Peter take on an unprecedented asset recovery case for the Museum of Natural History: a stolen Tyrannosaurus Rex skeleton and its egg.
White Collar · S5, E10

Live Feed

A life hangs in the balance after Hagen tasks Neal with his final assignment.
Supernatural · S6, E10

Caged Heat

Meg kidnaps Dean and Sam and tries to make them reveal Crowley's location; Sam tries to find out how to get his soul back.
Supernatural · S6, E4

Weekend at Bobby's

Bobby asks Dean and Sam for help after Crowley refuses to return Bobby's soul; a deep secret about Crowley is revealed.

Mark Sheppard

Shows

Guest Appearances