<Li> Nicholas Brendon as Kevin Lynch </Li> <Li> A.J. Cook as Jennifer "JJ" Jareau </Li> <P> In the season premiere "The Longest Night", Tim Curry reprised his role as one of the series' most notorious criminals, Billy Flynn, also known as "The Prince of Darkness". Robert Davi reprised his role as Detective Adam Kurzbard, who led the investigation of the murders . In the episode "J.J.", Chris Marquette guest - starred as James Barrett, a man who abducted and attempted to murder Kate Joyce . In the episode "Remembrance of Things Past", Daniel J. Travanti guest - starred as Lee Mullens, a serial killer who suffers from alzheimer's disease . In the episode "Compromising Positions", Craig Sheffer guest - starred as James Thomas, an impotent serial killer who murders married couples . </P> <P> In the episode "Safe Haven", Sterling Beaumon guest - starred as Jeremy Sayers, a juvenile delinquent and family annihilator who has been hated by his mother ever since he was born . Mare Winningham guest - starred as Nancy Riverton, a mother who allows Jeremy to stay in their home for the night . In the episode "Devil's Night", Leonard Roberts guest - starred as Kaman Scott, a disfigured serial killer who burns his victims alive during Devil's Night, the notorious pre-Halloween celebration . In the episode "Middle Man", Steve Talley, Michael Grant Terry, and Jake Thomas guest - starred as Michael Kosina, Christopher Salters, and Scott Kagan, aka "The Johnson County Brotherhood", a trio of serial rapists and killers who abduct exotic dancers . Melissa Claire Egan guest starred as Tara Dice, an exotic dancer who is questioned by Prentiss and Reid . </P>

Who played the prince of darkness in criminal minds