Frederick Worlock

as Horace (voice) (archive footage)

as Lord Burghley

as Blodgett

as Mr. Martindale (Lawyer) (uncredited)

as Lord Derby

as Elderly Colonel (uncredited)

as Horace / Inspector Craven (voice)

as Laelius

as Earl of Gloucester

as Lord Mayor (uncredited)

as Judge (uncredited)

as Prosecutor (uncredited)

as Duke of Bedford, England's Regent

as J. Norton Sims

as Gen. Webb

as Actor in "Othello"

as Cadum

as Inspector Hobday

as Clerk

as Prof. William Kilbane

as Colonel Cavanaugh

as Doctor (uncredited)

as Park Patrol Constable-in-Charge Ernie Hobbs

as Henderson

as John Brent

as Sir Humphrey Mong

as Landers - Newgate Prison Governor (uncredited)

as Dr. Onslow

as Supt. Clay (uncredited)

as Prime Minister

as Patrick Berwick

as Sam--Waiter at Inn

as Radio Newscaster (voice) (uncredited)

as Geoffrey Musgrave

as Businessman (uncredited)

as Otto

as Von Ritter - Ministry of Information (uncredited)

as Sir James Langley

as Sir Roger Wembley

as Eugene Caldwell (as Frederic Worlock)

as Hugo Stregel

as Speaker of Assembly (uncredited)

as Grenfall

as President of Court Martial

as Aristocratic Landowner (uncredited)

as Dr. Jackwin

as Solicitor-General

as Dr. Richards

as Lord Gerald Risborough

as Sir Henry

as Dr. Heath

as Canadian Major

as Lord Elfie (uncredited)

as Darnell

as Sir William Johnson

as Defense Counsel

as Communist President

as English Governor

as Grideau, the Prison Head

as Insp. Hugh Drake

as Stephen Harmon

as Dr. Cesar Sabbatt

as Colonel Demassey

as Ramensky

as Judge

as Gus Harrison