Stanley Van Beers

as Forbes

as Inspector Castaing

as British colonel

as Benedict

as Maurice Hurry

as Mario

as Commissaire

as Apothecary

as Colonel Sapt

as Mayor Kuo

as Chauvelin

as Ludwig Reichenheim (uncredited)

as Sir David Pye, C.B., F.R.S.

as Harry

as General

as Cartwright

as Mr. Lovegrove

as Professor Perronet

as Judge (uncredited)

as Calvert

as Earl of Broadstairs