Lionel Jeffries

as Jekyll's Father

as Jarvis Huntley-Pike

as Mr. Snoddy

as Colonel Zapt

as Kraftstein

as Police Insp. Willoughby

as Grandpa

as Solicitor

as Randomhouse

as Grandpa Potts

as King Pellinore

as Sir Charles Dillworthy

as Parker

as Sergeant-Major McGregor

as Cark

as Captain Rhumstone

as Joseph Cavor

as Aziz

as Colonel Judd

as Ezra

as Inspector Fred 'Nosey' Parker

as Det. Insp. Hook

as Inspector Oliphant

as Monsieur Brun

as Chief Prison Officer Sidney Crout

as Ames

as Marquis of Queensberry

as Ian Howard

as Pet Shop Owner (uncredited)

as Interrogator

as Fritz

as Colonel (Medical Officer)

as Joe Mangan

as Geoffrey Windsor

as Keith

as Wilson

as Dr. Peyron

as Lt Graham McDaniel

as Blake

as Harry Tyler