Peter Noone as Herman

Karl Green as Karl

Keith Hopwood as Keith

Derek Leckenby as Derek

Barry Whitwam as Barry

Shelley Fabares as Louisa Page

Sue Ane Langdon as Cecile Bannister

Herbert Anderson as Ed Lindquist

Bernard Fox as Dudley Hawks

Harry Hickox as Colby Grant

Hortense Petra as Henrietta Page

Mickey Deems as Publicist

Ray Kellogg as Detective #1

John Hart as Detective #2

Phil Arnold as Photographer

Bill Baldwin as Television Newscaster (uncredited)

Robert Nunn as Boy on Airplane (uncredited)

Jeffrey Sayre as Benefit Attendee (uncredited)