- Unknown:
- C. V. Wedgwood
- Unknown:
- Richard Pasco
- Narrator:
- Basil Jones
- Produced By:
- Dorothy Baker
- Produced By:
- Richard Pasco
- Three citizens of London:
- John Wyse
- Three citizens of London:
- Garard Green
- Three citizens of London:
- Frank Henderson
- Thomas Herbert, attendant on the King:
- Nigel Anthony
- Charles I:
- Richard Pasco
- Col Tomlinson:
- Nigel Clayton
- Oliver Cromwell:
- Jack May
- Hugh Peter, an army chaplain:
- Haydn Jones
- Thomas Harrison:
- Basil Jones
- Algernon Sidney:
- Victor Lucas
- Thomas, Lord Fairfax:
- David Brierlfy
- John Bradshaw:
- Denis McCarthy
- Henry Marten, M P:
- Peter Baldwin
- Commissary General Henry Ireton, Cromwell's son-in-law:
- Paul Harris
- Lady Fairfax:
- Pauline Letts
- Clerk of the Court:
- Francis de Wolff
- John Cook, Solicitor-General:
- Geoffrey Wincott
- William Juxon, Bishop of London:
- Alan Dudley
- A citizen's wife:
- Hilda Schroder
- John Downes, M P:
- Bill Horsley
- Princess Elizabeth:
- Pauline: Letts
- Henry, Duke of Gloucester:
- Simon Turner
