John Loder

as Ponsford 'The Duke'

as Paul Marchant

as Felix Courtland

as Dr. Matt Adams

as Dr. David Brent

as Reginald Parker / Edward Grey

as Manning

as Preston Drake

as Sir Henry Leland

as Carlton De Witt

as Elliot Livingston

as Ianto Morgan

as Reggie Carstairs

as Inspector Jim Grant

as Sir Henry Curtis

as Ted

as Dick Haslewood

as Paul

as Hugh Phillips

as Peynell

as Mr. Loder

as Franz Shiller

as Jack Oakhurst

as Captain Dorchester

as Viscount