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

Gryphon

Duke of Cleves

Harris

Wilberforce Strangeways

Ollie's Hospital Roommate

Duke

Richard Bentinck

Jellicott

Lord Eustace

Basil Pistol

James Raleigh

Sylvester Wadsworth

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

Mr. Spangle PhD.

Det. Hall

Lord Tarbotham

Monty Montgomery

Alfred Wimbledon

Harold Crosby, cub reporter

Andre's Assistant

Henry Fuller

Arthur Rockmere

Dal Brown

Gerly - The Valet

Theodore Van Felt

Dr. Harry Oldershaw

Archie

Lord Allan Harrowby

Mr. Belknap-Jackson

Wilbur

Peter Carter

Reggie Barrett