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

Robert Vaughn
Napoleon Solo (uncredited)

Regina Carrol

Theo Marcuse
Gregor

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)

Theo Marcuse
Gregor - Spy with Cigar (uncredited)