Frederick Worlock

as Horace / Inspector Craven (voice)

as Laelius

as Dr. Richards

as Gus Harrison

as Dr. Heath

as Darnell

as Radio Newscaster (voice) (uncredited)

as Prof. William Kilbane

as Dr. Onslow

as Sam--Waiter at Inn

as Colonel Cavanaugh

as Judge

as Lord Gerald Risborough

as Geoffrey Musgrave

as Speaker of Assembly (uncredited)

as Duke of Bedford, England's Regent

as Prime Minister

as Actor in "Othello"

as Prosecutor (uncredited)

as Supt. Clay (uncredited)

as Park Patrol Constable-in-Charge Ernie Hobbs

as Sir William Johnson

as Elderly Colonel (uncredited)

as Grideau, the Prison Head

as Businessman (uncredited)

as Doctor (uncredited)

as Blodgett

as Landers - Newgate Prison Governor (uncredited)

as Lord Mayor (uncredited)

as President of Court Martial

as J. Norton Sims

as Canadian Major

as Solicitor-General

as Otto

as Mr. Martindale (Lawyer) (uncredited)

as Cadum

as Judge (uncredited)

as Insp. Hugh Drake

as Dr. Cesar Sabbatt

as Clerk

as English Governor

as Colonel Demassey

as Inspector Hobday

as Sir Henry

as Sir Humphrey Mong

as Lord Elfie (uncredited)

as Sir Roger Wembley

as Horace (voice) (archive footage)

as Gen. Webb

as Ramensky

as Von Ritter - Ministry of Information (uncredited)

as Defense Counsel

as Stephen Harmon

as John Brent

as Earl of Gloucester

as Eugene Caldwell (as Frederic Worlock)

as Grenfall

as Sir James Langley

as Patrick Berwick

as Hugo Stregel

as Lord Derby

as Aristocratic Landowner (uncredited)

as Dr. Jackwin

as Communist President

as Lord Burghley

as Henderson