as Sol Goldstein
as Fritz Benner
as Strasser
as Jacques Dumaine
as Dr. Fred Webber(1 ep)
as Stovich(2 eps)
as Schabel
as Schnable(1 ep)
as Col. Dunkhepf
as Rudolph Reisenweber
as Dr. Jan Vanovech
as Pirot
as Vladek(1 ep)
as Victor Grigov(1 ep)
as Dr. Oswald Beck(1 ep)
as Matthew Brecker(1 ep)
as The Baron(1 ep)
as Ambassador Hodin(1 ep)
as Alex Keeler(1 ep)
as Heinrich Kleist(1 ep)
as Dr. Leland Mayes Elmont(1 ep)
as Dr. Jan Vanovech(2 eps)
as Gustave
as Baron(1 ep)
as Mr. Stryver(1 ep)
as Perelli
as The Colonel(1 ep)
as M. Victor
as Dr. Hermann Schneider
as Professor Dofee
as Signor Mantalini
as Paddy Maclure
as Beckstein
as Lex
as Deutsch
as Minelli
as Mugsy
as Blumel
as Petrovini(1 ep)
as Poppi
as Franco
as Wolfgang Wilhelm Winkel II (Swiss waiter)
as Arthur Crook(1 ep)