- Tim Barrett - Christopher Vaughan
- Clive Morton - Sir Wilfred Templar
- Donald Webster - Weedy
- Simon Prebble - Barrington-Pym
- Windsor Davies - Sullavan
- Geoffrey Reed - Hard Man
- Keith Pyott - Bishop
- June Watson - Miss Dunner
- Ingrid Hafner - Abigail Whitebait
- Kevin Brennan - Whitebait
- Oliver Johnston - Samson Whitby
- Aubrey Morris - Robag
- Patrick Kavanagh - Major Ironside
- Robert McBain - Jolyon de Farge
- Ian Trigger - Nonesuch
- Ray Gatenby - Bo
- Sandra Downs - Mary Bone
- George Ghent - Removal Man
- Betty McDowall - Beryl Kempsford
- William Moore - Harold Lemming
- Margery Withers - Miss Winkle
- Ivor Salter - Blinky
- Marian Spencer - Helena of Morphania
- Calvin Lockhart - Theobald Aboo
- Roger Hammond - Ferdinand XVIII of Morphania
- Nina Baden-Semper - Pearl
- Pauline Collins - Syrie's Maid
- Peter Stephens - Head of Department One
- Des Braiden - Head of Department Eight
- Peter Jesson - First Mr. Grimm
- Mark Hardy - Second Mr. Grimm
- Malcolm Douglas - Assassin
- Richard Everitt
Calvin Lockhart interpreta a Theobald Aboo en la serie.
Aubrey Morris interpreta a Robag en la serie.
John Sharp interpreta a Kronk en la serie.
Elizabeth Shepherd interpreta a Syrie Van Epp en la serie.
Gary Cockrell hace el papel de Phil Scrotty.
Alan Curtis interpreta a Insp. Blood en la serie.
William Maxwell hace el papel de Sgt. Hound.
Capítulo disponible en las siguientes plataformas:
