Connie Stevens as Cassie / Melinda Duquesne

Dean Jones as Val Henderson

Cesar Romero as John Harley 'Duke' Duquesne

Parley Baer as Jules 'Buzzy' Sheridan

Virginia Gregg as Dolly Bast

Connie Gilchrist as Ramona Ryerdon

John Hoyt as Attorney Carl Vickers

Russell Thorson as Mr. Carmichael (uncredited)

Leon Alton as Theatre Audience Member (uncredited)

Walter Bacon as Carnival Patron (uncredited)

Dick Cherney as Theatre Audience Member (uncredited)

Beulah Christian as Theatre Audience Member (uncredited)

William Conrad as Fat Man in Hall of Mirrors (uncredited)

Billy Curtis as Big Mike (uncredited)

George DeNormand as Theatre Audience Member (uncredited)

Ayllene Gibbons as Mourner at Funeral (uncredited)

Bobby Gilbert as Mourner at Funeral (uncredited)

Jimmie Horan as Mourner at Funeral (uncredited)

Richard Kiel as Photographer at Funeral (uncredited)

Ethelreda Leopold as Theatre Audience Member (uncredited)

Jon Lormer as Minister at Funeral (uncredited)

Philo McCullough as Theatre Audience Member (uncredited)

William Meader as Theatre Audience Member (uncredited)

Joseph Mell as Reporter at Funeral (uncredited)

Del Moore as Reporter Joe Russell (uncredited)

George N. Neise as Reporter at Funeral (uncredited)

Jerry Rush as Photographer (uncredited)