Richard Haydn

as Bookworm (voice) (uncredited)

as Herr Falkstein

as Andrew Kidder

as Quentin Bartlett

as Whitey

as Rupert Rowbotham

as Max Detweiler

as Mr. Hemingway

as Julian Clarington

as William Brown

as Sir Henry Vining

as Edwin Carp

as Prologue Narrator (uncredited)

as Prof. Summerlee

as Alfred North

as Bartlett Finchley

as The Accountant

as Oliver Wiggins

as Prime Minister

as Muche

as Stephen Spettigue

as John Fusenot

as Horatio

as Dr. Avord Barrett

as Bertie Searles

as Christopher Wellington St. John Denny

as Chancellor

as Baron Popoff

as Caterpillar (voice)

as Jerome Thisbee

as l'empereur François-Joseph

as Self

as Mr. Clarence Appleton

as Earl of Radcliffe

as Andre LeBlanc

as Deputy Commissioner Hewitt

as Horatio Willing

as Dr. Chisholm

as Jason Reid

as Jonathan Wilson

as Limo

as Thomas Rogers

as Specialty

as The Victim (voice) (uncredited)

as Roger Winant

as Mr. Fulcher

as George Lockwood

as Chuck

as Prof. Oddly

as Charley Wyckham