During the English Civil War in 1648, King Charles I is captured by Roundhead forces led by the tyrant Colonel Judd (Lionel Jeffries) and his right-hand man Captain Sylvester (Oliver Reed).
A band of Royalists – led by Edward Beverley (Jack Hedley), whose exploits earn him the title of ‘The Scarlet Blade’ – plot to rescue the King and many others of their side.
They are helped by Clare Judd (June Thorburn), daughter of the Ironside colonel in possession of Beverley Manor, who secretly helps them in defiance of her father.
Edward and Clare fall in love but Sylvester, who is also in love with Clare, threatens to betray their cause.
Edward is captured but eventually manages to escape with Clare.
Released as The Crimson Blade in some markets.
Colonel Judd
Lionel Jeffries
Captain Sylvester
Oliver Reed
Edward Beverley
Jack Hedley
Clare Judd
June Thorburn
Pablo
Michael Ripper
Jacob
Harold Goldblatt
Major Bell
Duncan Lamont
Philip
Clifford Elkin
Constance
Suzan Farmer
Sergeant Grey
John Harvey
Major John Drury
Charles Houston
Colonel Beverley
John Stuart
Cobb
Harry Towb
King Charles I
Robert Rietti
Fitzroy
John Watson
Blake
Douglas Blackwell
Gonzales
Leslie Glazer
Lieutenant Wyatt
John Woodnutt
Duncannon
Eric Corrie
Lieutenant Hawke
Michael Byrne
Director
John Gilling