Horace (voice) (archive footage)

Lord Burghley

Blodgett

Mr. Martindale (Lawyer) (uncredited)

Lord Derby

Elderly Colonel (uncredited)

Horace / Inspector Craven (voice)

Laelius

Earl of Gloucester

Lord Mayor (uncredited)

Duke of Bedford, England's Regent

Prosecutor (uncredited)

J. Norton Sims

Judge (uncredited)

Actor in "Othello"

Inspector Hobday

Cadum

Gen. Webb

Clerk

Doctor (uncredited)

Henderson

Colonel Cavanaugh

Park Patrol Constable-in-Charge Ernie Hobbs

Prof. William Kilbane

Landers - Newgate Prison Governor (uncredited)

Prime Minister

John Brent

Sir Humphrey Mong

Dr. Onslow

Supt. Clay (uncredited)

Sam--Waiter at Inn

Businessman (uncredited)

Radio Newscaster (voice) (uncredited)

Geoffrey Musgrave

Sir Roger Wembley

Sir James Langley

Von Ritter - Ministry of Information (uncredited)

Patrick Berwick

Otto

Eugene Caldwell (as Frederic Worlock)

Speaker of Assembly (uncredited)

Hugo Stregel

Aristocratic Landowner (uncredited)

Grenfall

Dr. Jackwin

Dr. Richards

Sir Henry

Canadian Major

Dr. Heath

Lord Gerald Risborough

Solicitor-General

English Governor

Insp. Hugh Drake

Communist President

Darnell

Stephen Harmon

Grideau, the Prison Head

Sir William Johnson

Lord Elfie (uncredited)

Ramensky

Colonel Demassey

Dr. Cesar Sabbatt