Bing Crosby as Harry Turner

Bob Hope as Chester Babcock

Joan Collins as Diane

Robert Morley as Leader of the 3rd Echelon

Walter Gotell as Dr. Zorbb

Felix Aylmer as Grand Lama

Dorothy Lamour as Dorothy Lamour

Roger Delgado as Jinnah

Jacqueline Jones as Blonde at Airport

Katya Douglas as 3rd Echelon Receptionist

Mei Ling as Ming Toy

Robert Ayres as American Official

Alan Gifford as American Official

Peter Sellers as Indian Neurologist (uncredited)

David Niven as Lama who remembers Lady Chatterly's Lover (uncredited)

Dean Martin as The 'Grape' on Plutomium (uncredited)

Frank Sinatra as The 'Twig' on Plutomium (uncredited)

Dave King as Mr. Ahso - Chinese Restaurant Owner (uncredited)

Pat O’Brien as Chinese Restaurateur (uncredited)

Peter Madden as Lama, Slim (uncredited)

Bob Simmons as Astronaut (uncredited)

Nosher Powell as Astronaut (uncredited)

Tutte Lemkow as Hotel Servant (uncredited)

Robin Hughes as American Official (uncredited)

Harry Baird as Nubian at Lamasary (uncredited)

Roy Patrick as Leader's Man(uncredited)

Victor Brooks as Leader's Man (uncredited)

John Dearth as Leader's Man (uncredited)

Jerry Colonna as Man Looking For a Match (uncredited)

Edwina Carroll as Girl (uncredited)

Sheree Winton as Girl (uncredited)

Michel Mok as Undetermined Role (as Michele Mok)