Mark Sheppard at an event for Supernatural (2005)

Mark Sheppard and Jesse Reid in Supernatural (2005)

Matt Bomer and Mark Sheppard in White Collar (2009)

Mark Sheppard, Jesse Reid, and Lee Shorten in Supernatural (2005)

Misha Collins and Mark Sheppard in Supernatural (2005)

Jensen Ackles, Mark Sheppard, and Kylee Bush in Supernatural (2005)

Jensen Ackles and Mark Sheppard in Supernatural (2005)

Jensen Ackles, Jared Padalecki, Mark Sheppard, and Samantha Smith in Supernatural (2005)

Mark Sheppard and Ruth Connell in Supernatural (2005)

Misha Collins and Mark Sheppard at an event for Supernatural (2005)

Jensen Ackles, Misha Collins, Jared Padalecki, and Mark Sheppard at an event for Supernatural (2005)

Jensen Ackles, Misha Collins, Jared Padalecki, and Mark Sheppard in Supernatural (2005)

JD Evermore, Lochlyn Munro, Mark Sheppard, William Morgan Sheppard, Pruitt Taylor Vince, and Gina Holden in Mysterious Island (2010)