Mildred NatwickNadia Demarest Eileen HeckartMargaret Quartermain Cloris LeachmanMargaret Sou Judith EvelynMrs. Collins Walter SlezakDr. Potterton / Richard Morley E.G. MarshallGavin Stevens Leslie NielsenSerge Soudekine Richard CooganInvestigator Westcott Morton StevensMr. O'Farrell Harold J. StoneEagle Moran Sidney BlackmerDr. Steven Archer Olive DeeringMuriel Torres Eva GaborMadeleine De Rochefort Martin E. BrooksMeros Leckow Jeffrey LynnJohn Bantreagh Ray WalstonHerbert the Hook Otto KrugerChester Crabtree Marjorie GatesonFlorence Hackett Luis van RootenMonsieur Vidocq Basil RathboneDr. Jekyll / Mr. Hyde Jack PalanceCount Alessandro di Cagliostro Thomas MitchellHenry Brown Henry JonesMan at Train Station Eddie AlbertDanny Maguire Louisa Horton HillAlice Martin Edmon RyanDistrict Attorney Russell CollinsEverett Kelsey Frank MarthLt. Captain Richter George MathewsPolice Detective Dana WynterPatricia Richter Isobel ElsomMrs. Cattermole Robert EmhardtMorgan Nelson Susan DouglasZita Bradford Felicia MontealegreElaine Bela LugosiGen. Fortunato Warren StevensBernard Frank Richard FraserClub President Otto PremingerCaptain von Weissenborn Virginia GilmoreCora Maybee 
