Herbert Fleischmann

as Dr. Schiller (archive footage)

as Inspector Hobbs

as Wilhelm Krüger (1 episode)

as Professor Blohm

as Herbert Kullmann (1 episode)

as Herbert Niessen (13 episodes)

as Herbert Waldmann

as Walter Mannhardt (13 episodes)

as Chefinspektor Yardley (2 episodes)

as Friedrich Wegener

as Schanz

as Major Loos (13 episodes)

as Bodo Lammers (1 episode)

as Herr Lahnstein senior

as Rolf Klein (1 episode)

as Onkel Gregor

as Helmut Schiefer

as Gustav Brandenburg

as Broll (1 episode), as Alfred Answald (1 episode), as Ernst Windorf (1 episode), as Herr Ludemann (1 episode), as Mahler (1 episode), as Professor Joachim von Haidersfeld (1 episode), as Dr. Wolfgang Rohm (1 episode)

as Addi (13 episodes)

as Roger Borchain (1 episode)