The Twilight Zone: Two (1961)

Synopsis
Season Three of Twilight Zone got off to a flying start with this episode, written and directed by Montgomery Pittman. Some five years after a devastating war that wiped out virtually all mankind, a pair of surviving soldiers from opposing armies confront each other in the deserted streets of a bombed-out city. Only the male soldier, played by Charles Bronson, has any dialogue; the female soldier, played by Elizabeth Montgomery, prefers to do her "talking" with a high-powered rifle. While the episode's ending is inevitable, the buildup to that ending takes a variety of unexpected twists and turns. Filmed on the old Hal Roach Studios backlot, "Two" originally aired September 15, 1961. ~ Hal Erickson, All Movie Guide