Glenn Wyatt 1 episode, 2016
Robert Cole 1 episode, 2014
Michael Kern (3 episodes, 2013-2014)
Chris Farnsworth (1 episode, 2017)
Michael Haas (1 episode, 2016)
Nick Dawson (1 episode, 2014)
Henry Jerrod (1 episode, 2011)
Agt. Richard Keller (1 episode, 2013)
Agent Roe / ... (2 episodes, 2010-2011)
Joe Hearn (2 episodes, 2009)
Jamie Burman (1 episode, 2014)
Brooks Volk (1 episode, 2015)
Dr. Richard Olsen (1 episode, 2009)
Clayton (4 episodes, 2008)
Jack McCraney, Conspiracy Analyst
Carter Wilcox / ... (2 episodes, 2009)
Mr. Chambers (3 episodes, 2007-2011)
Dr. Mervin Farber 1 episode, 2009
Detective Hubbard (1 episode, 2006)
Bill Fordham (1 episode, 2007)
Dwight Bernard 1 episode, 2010
Larry Sawyer (6 episodes, 2005-2006)
Richard 'Rich / Richie' Bernardi
William Boone (24 episodes, 1997-2001)
Eugene Gillrich / ... (2 episodes, 1992-1993)
Alex Georgi (3 episodes, 1990)