Edmund Purdom
Role: Michael Dermott
David Niven
Role: James - Duke of Brampton
George Sanders
Role: King Charles II
John Dehner
Role: Captain Herrick
Sean McClory
Role: Sheldon
Melville Cooper
Role: Henry Wynch
Alan Mowbray
Role: Sir Gilbert Talbot
Rhys Williams
Role: Turnkey
Joan Elan
Role: Charity Fell
Charles Davis
Role: Apothecary
Paul Cavanagh
Role: Sir Edward Scott
Lillian Kemble-Cooper
Role: Mrs. Fell
Isobel Elsom
Role: Mrs. Bennett
Milton Parsons
Role: Adam Urich
Lord Layton
Role: Jacob Hall
Queenie Leonard
Role: Apothecary's Wife
Owen McGiveney
Role: Hoskins
Jimmy Aubrey
Role: Little Man (uncredited)
Leonard Carey
Role: Servant (uncredited)
Leslie Denison
Role: Beadle (voice) (uncredited)
Ronald Green
Role: Hired Swordsman (uncredited)
Peter Hansen
Role: Sir Isaac Newton (uncredited)
Ramsay Hill
Role: Lord (uncredited)
Charles Keane
Role: Guard (uncredited)
Keith McConnell
Role: Usher (uncredited)
John Monaghan
Role: Shaddy (uncredited)
Matt Moore
Role: Gentleman (uncredited)
Clive Morgan
Role: Captain of Guards (uncredited)
Vesey O'Davoren
Role: Courier (uncredited)
Gordon Richards
Role: Courier (uncredited)
Lewis L. Russell
Role: Gentleman (uncredited)
Gilchrist Stuart
Role: Clerk (uncredited)
Trevor Ward
Role: Perspiring Man (uncredited)
Trude Wyler
Role: Celestine (uncredited)