William Austin

Barnaby

Forbes (uncredited)

Musician (uncredited)

Reporter (uncredited)

Detective Gannett

Alfred

Spectator

Inquisitive Stranger

Mr. Martingale

Bob's Butler (uncredited)

Constable Holly

Sneed, Hammle's Butler (Uncredited)

Salesman

Arthur Summers

Trelawney Redfern

Clerk in Chase's office

Englishman at Party (uncredited)

Cyril Glossop

Mathews

Gryphon

Duke of Cleves

Harris

Wilberforce Strangeways

Ollie's Hospital Roommate

Duke

Richard Bentinck

Jellicott

Lord Eustace

Basil Pistol

James Raleigh

Sylvester Wadsworth

Partygoer ('Impulses') (uncredited)

Mr. Poffley

Jasper Hickson

Lord Wrench

Prof. Percy Willow

Mr. Z

Sylvester Wadsworth

Percy Penfield

Aubrey Weems

Percy Jones

Engineer

Dr. Eustace Gill

Raymond of Boston

Banning-Green

George Bagnall

Mr. Spangle PhD.

Det. Hall

Algy

Lord Tarbotham

Monty Montgomery

Louis Carruthers

Alfred Wimbledon

Mortimer Allison

Harold Crosby, cub reporter

Andre's Assistant

Eric Lancefield

Henry Fuller

Riggs

Arthur Rockmere

Dal Brown

Gerly - The Valet

Theodore Van Felt

Dr. Harry Oldershaw

George Sears

Archie

Joe's Friend (uncredited)

Lord Allan Harrowby

Mr. Belknap-Jackson

Reggie

Wilbur

Peter Carter

Reggie Barrett