Robert Morse as Dennis Barlow

Jonathan Winters as Wilbur Glenworthy / Harry Glenworthy

Anjanette Comer as Aimee Thanatogenos

Rod Steiger as Mr. Joyboy

Dana Andrews as Gen. Buck Brinkman

Milton Berle as Mr. Kenton

James Coburn as Immigration Officer

John Gielgud as Sir Francis Hinsley

Tab Hunter as Whispering Glades Tour Guide

Margaret Leighton as Mrs. Helen Kenton

Liberace as M. Starker, Whispering Glades Funeral Salesman

Roddy McDowall as D.J. Jr.

Robert Morley as Sir Ambrose Abercombie

Barbara Nichols as Sadie Blodgett

Lionel Stander as The Guru Brahmin ("Hump")

Roxanne Arlen as Whispering Glades Hostess

Dort Clark as Col. Burt

Pamela Curran as Whispering Glades Hostess

Robert Easton as Dusty Acres

Ayllene Gibbons as Joyboy's Mother

Don Haggerty as Haggerty

Chick Hearn as Space-Burial Funeral Announcer

Warren J. Kemmerling as Colonel

Claire Kelly as Whispering Glades Hostess

Bernie Kopell as Brahmin's Assistant

Asa Maynor as Secretary to D.J. Jr.

Alan Napier as British Club Official

Ed Reimers as Minister at Whispering Glades

Reta Shaw as Manager of The Zomba Cafe

Paul Williams as Gunther Fry

Joy Harmon as Miss Benson

Leoda Richards as Lady at Airport

Al McGranary as Board Member