Dr. Grant Harrison
Senator Smith
Chief Wells
Tom Claire
Under Secretary William Macomber
Unit Chief Shepard (11 episodes)
Preacher (voice)
General (1 episode)
Darren Hahn (2 episodes)
Admiral Lynch
Jack Davis (5 episodes)
Deputy Attorney General (14 episodes)
Federal Investigator (1 episode)
Forrest Burke (1 episode)
Phil Fryman
Denton Weeks (5 episodes)
Jay Barrett (1 episode)
Adam Wilson (1 episode)
Dick Thompson
Scotty MacGregor
Gordon Alexander (2 episodes)
Gerald Lucas (1 episode)
Sean McGinnis (1 episode)
Sam Stevens (2 episodes)
Governor Stan Preston (1 episode)
Tony Vincenzo (10 episodes)
Dr. Altman
Hank Foster (1 episode)
Richard Davies (6 episodes)
President McKenna
John Meyers
ASA Jeremy Friedman (4 episodes)
Silas Green
Loren Valentine (voice)
Judge Benjamin Fee (1 episode)
Eric Martin (1 episode)
Robert Creighton
Bill Brennecke (8 episodes)
Dr. Case Montgomery
Adam Nichols
Andrew Rawson (11 episodes)
Officer Rob Arnold
Tony Henderson (3 episodes)
Mike Caldwell
Nick Cowan
Eugene 'Gene' Rogan (27 episodes)
Gilliam
Sergeant Sam Taliaferro
Mac Odell
Robert Rhine (1 episode)
(segment "To See the Invisible Man") (1 episode)
Lt. Hugo
Brian Baker (1 episode)
Ned Holcomb
Chad Webster
Trucker
Robert F. Kennedy (2 episodes)
Dr. Rowe (1 episode)