Karen Valentine
— Carol Burnham / Carol Byrnes
John Davidson
— Dennis Burnham
Michael Anderson Jr.
— Tommy Byrnes
Louise Lasser
— Susan Edmonds
Lou Jacobi
— Waiter
Erica Hagen
— Lisa Benton
George Coulouris
— Doctor
Nora Marlowe
— Mrs. Fitzgerald
Kenneth Tobey
— Captain
James B. Sikking
— Businessman
Marcy Lafferty
— Stewardess
Cynthia Harris
— Dee Dee
Byron Webster
— London hotel Maitre'd (Uncredited)