Peter Noone
— Herman
Karl Green
— Karl
Keith Hopwood
— Keith
Derek Leckenby
— Derek
Barry Whitwam
— Barry
Shelley Fabares
— Louisa Page
Sue Ane Langdon
— Cecile Bannister
Herbert Anderson
— Ed Lindquist
Bernard Fox
— Dudley Hawks
Harry Hickox
— Colby Grant
Hortense Petra
— Henrietta Page
Mickey Deems
— Publicist
Ray Kellogg
— Detective #1
John Hart
— Detective #2
Phil Arnold
— Photographer
Bill Baldwin
— Television Newscaster (uncredited)
Robert Nunn
— Boy on Airplane (uncredited)
Jeffrey Sayre
— Benefit Attendee (uncredited)