Ann Blyth as Lady Mary

Edmund Purdom as Michael Dermott

David Niven as James - Duke of Brampton

George Sanders as King Charles II

Roger Moore as Jack

John Dehner as Captain Herrick

Sean McClory as Sheldon

Tudor Owen as Simon

Melville Cooper as Henry Wynch

Alan Mowbray as Sir Gilbert Talbot

Rhys Williams as Turnkey

Joan Elan as Charity Fell

Charles Davis as Apothecary

Ian Wolfe as Fell

Paul Cavanagh as Sir Edward Scott

Lillian Kemble-Cooper as Mrs. Fell

Isobel Elsom as Mrs. Bennett

Milton Parsons as Adam Urich

Lord Layton as Jacob Hall

Queenie Leonard as Apothecary's Wife

Owen McGiveney as Hoskins

Robert Dix as Husky

Michael Dugan as Husky

James Logan as Guard

Jimmy Aubrey as Little Man (uncredited)

Leonard Carey as Servant (uncredited)

Leslie Denison as Beadle (voice) (uncredited)

Ronald Green as Hired Swordsman (uncredited)

Peter Hansen as Sir Isaac Newton (uncredited)

Ramsay Hill as Lord (uncredited)

Charles Keane as Guard (uncredited)

Keith McConnell as Usher (uncredited)

John Monaghan as Shaddy (uncredited)

Matt Moore as Gentleman (uncredited)

Clive Morgan as Captain of Guards (uncredited)

Vesey O'Davoren as Courier (uncredited)

Gordon Richards as Courier (uncredited)

Lewis L. Russell as Gentleman (uncredited)

Gilchrist Stuart as Clerk (uncredited)

Trevor Ward as Perspiring Man (uncredited)

Trude Wyler as Celestine (uncredited)

Ashley Cowan as