Leigh Lawson as Percy Edward Anthony

Elke Sommer as Clarissa

Denholm Elliott as Sir Emmanuel Whitbread

Judy Geeson as Dr. Fairweather

Harry H. Corbett as Prime Minister

Vincent Price as Stavos Mammonian

Adrienne Posta as P.C. 217 'Iris'

Julie Ege as Miss Hanson

Barry Humphries as Dr. Anderson / Australian TV Lady

James Booth as Jeffcott

Milo O’Shea as Dr. Klein

Ronald Fraser as Bleeker

Anthony Andrews as Catchpole

Bernard Lee as Barraclough

Madeline Smith as Miss UK

Alan Lake as Derry Hogan

George Coulouris as Professor Godowski

Jenny Hanley as Angie - Miss Teenage Lust

Diane Langton as Maureen Sugden

Carol Hawkins as Maggie

Marika Rivera as Madame Lopez

Penny Irving as Chiquita

Judy Matheson as Maria

Gertan Klauber as Pablo

Michael Barratt as Self

Bernard Falk as Self

T. P. McKenna as London News Editor

Edgar Metcalfe as London Newsman

Anthony Sharp as Judge

Alan Tilvern as General Dodds

Graham Weston as Brian

Minah Bird as Miss America

Marlene Morrow as Miss Australia

Ludmila Nova as Miss France

Karan David as Miss Israel (as Karen David)

Emily Bolton as Miss Thailand (as June Bolton)

Vikki Richards as Dolores (uncredited)

Lai Ling as (uncredited)

Olga Anthony as Whitbread's Assistant (uncredited)

Angus McKay as (uncredited)

Marianne Stone as Reporter (uncredited)