Charles Hawtrey

Clarence, Duke of Claridge

Private 'Professor' Hatchett

Mr. Charlie Muggins

Humphrey Hinton

Mr. Eustace Tuttle

Gabriel Dimple

Studious Youngster (uncredited)

Dr. Francis A. Goode

Mr. Barron

Seneca

Chief Big Heap

Mr. Charles Coote

Various Characters (archive footage) (uncredited)

Thomas Duckett

Railway Porter

Sir Roger de Lodgerley

Mr. James Bedsop

Agent Charlie Bind

Captain Gerrard Le Pice

Mr. Michael Bean

Terry "Pintpot" Tankard

Max

Duc de Pommfrit

Private Jimmy Widdle