Mildred NatwickNadia Demarest Eileen HeckartMrs. Haskell Cloris LeachmanMargaret Sou Judith EvelynMrs. Collins Walter SlezakFrank Cadwallader E.G. MarshallGavin Stevens Leslie NielsenSerge Soudekine Richard CooganInvestigator Westcott Cara WilliamsBetty Marshall Harold J. StoneEagle Moran Sidney BlackmerDr. Steven Archer Olive DeeringMuriel Torres Eva GaborMadeleine De Rochefort Gaby RodgersJoanie Lennox Robert H. HarrisDr. Tabor Martin E. BrooksMeros Leckow Jeffrey LynnJohn Bantreagh Ray WalstonTicket Seller (uncredited) Otto KrugerChester Crabtree Marjorie GatesonFlorence Hackett Luis van RootenMonsieur Vidocq Basil RathboneDr. Jekyll / Mr. Hyde Jack PalanceCount Alessandro di Cagliostro Thomas MitchellHenry Brown Eddie AlbertDanny Maguire Louisa Horton HillSally Turner Edmon RyanDistrict Attorney Russell CollinsEverett Kelsey Frank MarthLt. Captain Richter George MathewsPolice Detective Dana WynterPatricia Richter Isobel ElsomMrs. Cattermole Robert EmhardtArnold Sachs Susan DouglasZita Bradford Felicia MontealegreElaine Bela LugosiGen. Fortunato Warren StevensBernard Frank Richard FraserClub President Otto PremingerCaptain von Weissenborn Virginia GilmoreCora Maybee Max Simon EhrlichSchrijver Charles RobinsonSchrijver Cornell WoolrichSchrijver 
