SURVIVOR (1987)

An astronaut, known only as The Survivor, returns from space only to find Earth a desolate, post-nuclear wasteland. Spending the next ten years searching for others, he finds rumors and signs of a hidden underground city. He finds a woman who claims to know where the city is, but she is kidnapped before she can tell him. Desperate to locate this hidden remnant of humanity, he begins his pursuit of her captors.