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

Alice Pearce

Mabel Fenimore

George Tobias

Norman Fenimore

Ellen Corby

Anna Miller

Dee J. Thompson

Donna

Robert Vaughn

Napoleon Solo (uncredited)

Regina Carrol

Minor Role (uncredited)

Theo Marcuse

Gregor

Carolyn Williamson

Party girl

Rachel Romen

Reporter (uncredited)

George Carlin

Unknown (uncredited)

George Cisar

Fat Man (uncredited)

John Dennis

Policeman (uncredited)

Florence Halop

Lady on Telephone (uncredited)

Frank Parker

Engineer (uncredited)

Christopher Riordan

Party Guest / Computer Plant Worker (uncredited)

Tom Anfinsen

Party Guest (uncredited)

Spencer Chan

Chef (uncredited)

George Ford

Party Guest (uncredited)

James Gonzalez

Party Guest (uncredited)

Theo Marcuse

Gregor - Spy with Cigar (uncredited)

Hans Moebus

Party Guest (uncredited)

Joe Ploski

Husband (uncredited)

Murray Pollack

Party Guest (uncredited)

Bernard Sell

Party Guest (uncredited)