Peter Sellers
Chance
Shirley MacLaine
Eve Rand
Melvyn Douglas
Benjamin Rand
Jack Warden
President 'Bobby'
Richard Dysart
Dr. Robert Allenby
Richard Basehart
Vladimir Skrapinov
Ruth Attaway
Louise
David Clennon
Thomas Franklin
Fran Brill
Sally Hayes
Denise DuBarry
Johanna Franklin
Alice Hirson
First Lady
Jerome Hellman
Gary Burns
John Harkins
Sidney Courtney
James Noble
Kaufman
Mitch Kreindel
Dennis Watson
Oteil Burbridge
Lolo
Richard Venture
Wilson
Sam Weisman
Colson
Ilya Baskin
Karpatov
Hal Ashby
Man at File Cabinet at the Washington Post (uncredited)
Kenneth Patterson
Perkins
Stanley Grover
Baldwin