Baron Von Richthofen
Self (archive footage) (2 episodes)
Bishop Harry
Uncle Harold
Magistrate (1 episode)
Winston Churchill
Mr Finister
Harry Gold (1 episode)
Richard 'Mr Dick' Babley (5 episodes)
Johnny Davenport
Ned Quilley
Major John Sholto
Hugo Birch
Old Wedding Guest
Old Wedding Guest (1 episode)
Colonel Bloodstock (3 episodes)
Hugo Culpepper Brown
Charles the Sixth, King of France
Mr. Justice Fleminge (1 episode)
Lord Lochmaben (1 episode)
Dr. Watson
Grasshopper
Col. Redfern (1 episode)
Sir Ramsey
Sir Ramsey (1 episode)
Wing Commander
Chalcott-Bentinck
Home Secretary
Stanley Baldwin (1 episode)
Dr. Ledworth (1 episode)
General Erhardt
Dr. Ledworth
The Prince (1 episode)
Edward, Prince of Wales (1 episode)
King Edward VII (1 episode)
Major Finn
Burgermeister
Maj. Edward Woolley (4 episodes)
John Hatton (1 episode)
Baron Hector Hulot (5 episodes)
Mr. Forbush Sr.
Manager of Carlton Hotel
Chief Dreamer (1 episode)
The Colleague
Magistrate
Frank Bellamy
Forbes-Erskine (1 episode)
Doctor Watson (uncredited)
Insp. Fritsch
Gen. Jowett
Hubbard
Staff Officer
Sir John Forrester
Sir Joshua Hoot (19 episodes)
Dr. Hertz
Patience
Martin Roth
Chief Constable Preston
Col. Grant
Estate agent
Edgar Otis
Cmdr. Winters
Tranquilax Executive
Lattimer
Captain Jerome Robertson
Cedric Ackenthorpe
Colonel Parkright
Special Agent Prince
Colonel Edmonds
Colonel Bellingham
Mr. Smith
Major Whitehart
Professor Mortimer (1 episode)
Photographer
Trevor Eaton
Charles
Lt. Setley
Raymond Courtney
Captain Bootle
Chadwick
Salesman
Army Officer (uncredited)
Stefan Ravenne
Channing
Max Von Reimer
Huey Frazer
Unidentified role
Chemist
Beamish