Malcolm Waite

as Big Strength Machine Contestant (uncredited)

as Cocky

as Miner (uncredited)

as Captain of Guards

as Juryman

as Jamison - the smelter

as Fireman

as Murphy

as Higgins the Butler

as Ted Grant

as The Balkan Prisoner / Shem

as Prof. Saenger

as Sea Captain

as Dan Bell

as Bergerin

as Jack Shields

as Big Boyle

as Blanco Johnson

as Jeff Hoades

as Pete Krell

as Clem Allison

as Carter

as Denman

as Jack Cameron

as Donald Duffield - Harry's Rival

as Big-Boy

as (uncredited)