Narrator (10 episodes, 2003-2004)
Narrator (8 episodes, 2002-2003)
(5 episodes, 2002-2003)
(4 episodes, 2002-2003)
(4 episodes, 2003-2004)
Dr. Brixey Shelton / George Demas / Son in Law (3 episodes, 2002-2004)
(3 episodes, 2002-2004)
(3 episodes, 2002-2003)
(3 episodes, 2002)
(3 episodes, 2003-2004)
(3 episodes, 2003)
(3 episodes, 2004)
(2 episodes, 2002-2004)
Father (2 episodes, 2002-2004)
(2 episodes, 2002-2003)
Chris Getty (2 episodes, 2002-2003)
Ice Skater's Mom / Physical Therapist (2 episodes, 2002-2003)
Hot Tub Salesman / Store employee (2 episodes, 2002)
(2 episodes, 2002)
Joane Dulek / Sick Kid (2 episodes, 2002)
(2 episodes, 2003-2004)
Construction Forman / NIOSH Offical (2 episodes, 2003)
(2 episodes, 2003)
(2 episodes, 2004)
(1 episode, 2002)
Cathy Reich (1 episode, 2002)
Headmistress (1 episode, 2002)
Delivery man (1 episode, 2002)
Dr. Pat Hudson (1 episode, 2002)
Restaurant Owner (1 episode, 2002)
Dr. Quetch (1 episode, 2002)
Patient #2 (1 episode, 2002)
Agent Renee DiGarcia (1 episode, 2002)
Nurse #4 Pilot (1 episode, 2002)
Mr. Mulvale (1 episode, 2003)
(1 episode, 2003)
EPA Official (1 episode, 2003)
Kayla's sister (1 episode, 2003)
Doctor Amin (1 episode, 2003)
Lab Technician (1 episode, 2003)
Fisherman (1 episode, 2003)
CDC Agent (1 episode, 2003)
Self (1 episode, 2003)
(1 episode, 2004)
Bobby Curly (1 episode, 2004)
Blanche Moore (1 episode, 2004)
Hospital Patient (1 episode, 2004)
Nurse (1 episode, 2004)
Jennifer Thompson (1 episode, 2004)
Jim Boley's Sister (1 episode, 2004)
Phil Rouss (1 episode, 2004)
British Commitee Member 2003 (1 episode, 2004)
Dr. Mike Osterholm (1 episode, 2004)
Joann Curley (1 episode, 2004)
Allan Massey (1 episode, 2004)