- Doris Day
- Jennifer Nelson
- Rod Taylor
- Bruce Templeton
- Arthur Godfrey
- Axel Nordstrom
- John McGiver
- Ralph Goodwin
- Paul Lynde
- Homer Cripps
- Edward Andrews
- Gen. Wallace Bleecker
- Eric Fleming
- Edgar Hill
- Dom DeLuise
- Julius Pritter
- Dick Martin
- Zack Molloy
- Elisabeth Fraser
- Nina Bailey
- George Tobias
- Mr. Fenimore
- Alice Pearce
- Mrs. Fenimore
- Ellen Corby
- Anna Miller
- Dee J. Thompson
- Donna
- David Ahdar
- Party Guest
- Richard Alden
- Executive
- Don Anderson
- Party Guest
- Tom Anfinsen
- Party Guest
- Shirley Anthony
- Party Guest
- Ellen Atterbury
- Wife
- Bella Bruck
- Minor Role
- William Burnside
- Reporter
- Boyd Cabeen
- Party Guest
- George Carlin
- Unknown
- Regina Carrol
- Minor Role
- Pat Casella
- Secretary
- Jerry Catron
- Executive
- Spencer Chan
- Chef
- George Cisar
- Fat Man
- Robert Cole
- Party Guest
- Bill Cord
- American
- Suzanne Covington
- Party Guest
- John Dennis
- Policeman
- Dick Dial
- Executive
- Dan Dowling
- Party Guest
- Ken DuMain
- Caterer
- Roy Eason
- Executive
- Joe Evans
- Waiter
- George Ford
- Party Guest
- James Gonzalez
- Party Guest
- M. Hakim
- Henchman
- Florence Halop
- Lady on Telephone
- Joe Haworth
- Reporter
- Casse Jaeger
- Party Guest
- Kathryn Janssen
- Party Guest
- Maurice Kelly
- Reporter
- Richard Kindelon
- Party Guest
- Paul King
- Chef
- Jeff Lawrence
- Party Guest
- James Macklin
- Policeman
- Mike Mahoney
- Reporter
- Theodore Marcuse
- Gregor - Spy with Cigar
- Gregg Martell
- Russian
- Hans Moebus
- Party Guest
- Frank Parker
- Engineer
- Joe Ploski
- Husband
- Murray Pollack
- Party Guest
- Christopher Riordan
- Party Guest / Computer Plant Worker (uncredited)
- Michael Romanoff
- Husband
- Rachel Romen
- Reporter
- Jeffrey Sayre
- Party Guest
- Bernard Sell
- Party Guest
- George Simmons
- Party Guest
- Norman Stevans
- Party Guest
- Charles Stewart
- Reporter
- Larry Strong
- Engineer Space Center
- Blaine Turner
- Caterer
- Leslie Vallen
- Miss Perkins
- Robert Vaughn
- Napoleon Solo
- Charles Victor
- Minor Role
- Carolyn Williamson
- Party Girl
