The Love War

The Love War 1970 is a science fiction ABC Movie of the Week starring Lloyd Bridges as an alien warrior and Angie Dickinson as the woman he befriends.

Kyle Lloyd Bridges, one of the combatants, falls in love with Sandy Angie Dickinson, a woman he meets during his stay in a small town. In the end, despite cheating by the other side, Kyle is the sole survivor. But before he can signal his people he has won, Sandy shoots him with one of the alien weapons. A dying Kyle then learns that Sandy is also an alien the other side has cheated twice. She chose duty to her people over her love for him. Weeping as she watches him die, she asks him what their halfbreed children would have been. The films closing shot shows Sandy through the visor as she really is a hideously scarred humanoid. The Earth faces an orgy of destruction and the extermination of humanity.The setting is Kansas, as revealed by a dilapidated sign during the shootout bearing the words Spivey, Kansas. ........

Source: Wikipedia