* Robert Shaw as Dr. Thomas "Tommy" Ross
* Martine Beswick as Dahlia Iossif
* Bruce Dern as Frederick "Freddy" Asch
* Fritz Weaver as General "Big" Dave Rosenthal
* Richard Widmark as Colonel Abraham "Abe" Feldman
* Arthur Kennedy as Captain "Cap" Santen
* James Earl Jones as The Black Man
The film also features many smaller roles, including some recognizable character actors.