Simon Lack

as Zadek

as Major Freidel (21 episodes)

as Thomas Whamond

as John Bott

as John Bott (1 episode)

as Pamphilius

as Zhukovsky (1 episode)

as George Heriot (4 episodes)

as Colonel Andreyev (1 episode)

as Colonel Pugh (1 episode)

as Andrew Campbell (1 episode)

as Professor Kettering

as Colonel Vickers

as Andrew Seton (1 episode)

as Endell's Q.C.

as Mr. Parker

as Peter Tolchard

as Count Maretta (1 episode)

as British Major (1 episode), as Alfred Lockhart (1 episode)

as Dr. Jack Morton (13 episodes)

as Menteith

as Dragoon Corporal

as Professor Kettering (1 episode), as Zadek (4 episodes)

as Control officer (1 episode)