David Hurst

as Sol Goldstein

as Fritz Benner

as Strasser

as Jacques Dumaine

as Dr. Fred Webber (1 episode)

as Stovich (2 episodes)

as Schabel

as Schnable (1 episode)

as Col. Dunkhepf

as Rudolph Reisenweber

as Dr. Jan Vanovech

as Pirot

as Vladek (1 episode)

as Victor Grigov (1 episode), as Dr. Oswald Beck (1 episode)

as Matthew Brecker (1 episode)

as The Baron (1 episode)

as Ambassador Hodin (1 episode)

as Alex Keeler (1 episode)

as Heinrich Kleist (1 episode)

as Dr. Leland Mayes Elmont (1 episode), as Dr. Jan Vanovech (2 episodes)

as Gustave