James Collier (1 episode, 2011)
Oleg Olesky (1 episode, 2011)
Remy Farnwell (12 episodes, 2010)
Remy Farnwell (12 episodes, 2010)
Hugh Prentiss (1 episode, 2010)
GDD Director Gara Singh / ... (6 episodes, 2010)
Dr. James Watson (3 episodes, 2008-2010)
Dr. Harbeck (2 episodes, 2008)
Sean Redburn (1 episode, 2006)
OSC Agent Jon Krakauer / ... (4 episodes, 2004)
Whit Strobel / ... (2 episodes, 2006-2007)
Benton Knight 1 episode, 2004
David Emerson (5 episodes, 2009)
Marcus Becker (1 episode, 2005)
Dr. Robert Helm (21 episodes, 2000-2001)
Terrance Shepard (3 episodes)
Dan Clifford (45 episodes, 2006-2009)
Insp. Simon Ross (14 episodes, 1998-1999)
Tanith / ... (3 episodes, 2000-2001)
Dave Simmonds (2 episodes, 2006)
Dwight Bordon (1 episode, 2000)
John Westlock (5 episodes, 1994)
Adam Pierson / ... (22 episodes, 1995-1998)
Lt Nick Pasco (6 episodes, 1991)
Alex Taylor (10 episodes, 1990-1992)