John Longden

as Self (archive footage) (1 episode)

as Prof. Hubbard

as Munch

as American Ambassador (1 episode)

as Sir Thomas (5 episodes)

as Mr. Turner

as Julian Caesar

as Mercer (1 episode), as Superintendent Mercer (39 episodes)

as Inspector Syms

as Lord Ruskington (1 episode)

as Egeus

as Admiral

as De La Fayette

as Warder

as Chief Inspector Lomax

as Richard Sandford

as The Abbot (1 episode), as Archbishop (1 episode), as Ned (1 episode), as Count Leger (1 episode), as Sir Gyles of Wren (1 episode), as Lord Blackstone (1 episode), as Chambertin (1 episode), as Walter Fitzurse (1 episode), as Wulfric (1 episode), as Tailor (1 episode), as Sir Walter De Lys (1 episode), as Hodges (1 episode)

as Detective

as Simon Graves (1 episode), as Albert Lake (1 episode)

as Jeremy Meraulton

as Worthington