Doris Day as Jennifer Nelson

Rod Taylor as Bruce Templeton

Arthur Godfrey as Axel Nordstrom

John McGiver as Ralph Goodwin

Paul Lynde as Homer Cripps

Edward Andrews as Gen. Wallace Bleecker

Eric Fleming as Edgar Hill

Dom DeLuise as Julius Pritter

Dick Martin as Zack Molloy

Elisabeth Fraser as Nina Bailey

Alice Pearce as Mabel Fenimore

George Tobias as Norman Fenimore

Ellen Corby as Anna Miller

Dee J. Thompson as Donna

Robert Vaughn as Napoleon Solo (uncredited)

Regina Carrol as

Theo Marcuse as Gregor

Carolyn Williamson as Party girl

Rachel Romen as Reporter (uncredited)

George Carlin as Unknown (uncredited)

George Cisar as Fat Man (uncredited)

John Dennis as Policeman (uncredited)

Florence Halop as Lady on Telephone (uncredited)

Frank Parker as Engineer (uncredited)

Christopher Riordan as Party Guest / Computer Plant Worker (uncredited)

Tom Anfinsen as Party Guest (uncredited)

Spencer Chan as Chef (uncredited)

George Ford as Party Guest (uncredited)

James Gonzalez as Party Guest (uncredited)

Theo Marcuse as Gregor - Spy with Cigar (uncredited)

Hans Moebus as Party Guest (uncredited)

Joe Ploski as Husband (uncredited)

Murray Pollack as Party Guest (uncredited)

Bernard Sell as Party Guest (uncredited)