John Longden

Self (archive footage)

Prof. Hubbard

Munch

Sir Thomas

Mr. Turner

Julian Caesar

Mercer

Superintendent Mercer

Inspector Syms

Lord Ruskington

Egeus

Admiral

De La Fayette

Warder

Chief Inspector Lomax

Richard Sandford

The Abbot

Chambertin

Sir Gyles of Wren

Walter Fitzurse

Lord Blackstone

Sir Walter De Lys

Archbishop

Wulfric

Count Leger

Tailor

Ned

Hodges

Detective

Simon Graves

Albert Lake

Jeremy Meraulton

Worthington

Man With Pipe

Speaker in Connaught Rooms

Mr. Kemp

Stephen

Sherlock Holmes

DI Williams

The Abbot

Inspector James

Colonel O'Sullivan

Gen. Serpuhousky

Mortimer Digby

Tod Jenkins

Narrator (voice) (uncredited)

Jost Meertens

Inspector Slade

Metcalf

Ground Officer (uncredited)

Paddy O'Brien

Commander

Bill

Stuart Gordon

Narrator

Passport officer

Unnamed Character

Raven (uncredited)

Captain Johnson (uncredited)

John Peters, a Pilot

Inspector Bliss

Inspector Thompson

Police Inspector Merton

Peter Ashton

Det. Insp. Kent

Bill Peel

Dean Maitland

Frank Dale

Anthony Xavier 'Tony' Benedik

Hugh Bromilow

Harry Crawford

Boyfriend

Harry Fielding

Inspector Wembury

Charles Hornblower

Jeffrey

Lt. Stanislaus von Zaminsky

Charles Bentham

Lieutenant Boris Boriskoff

Himself

Lanchester

Detective Frank Webber

Man from China (uncredited)

David / Martin

No. 1

Le Beau - Illusionist

Ivan

Joseph Quinney

Jack Meadows

Floquet