Walter Gibson, the last man on Earth after World War III, hears a desperate knocking on his door. Mark Gallagher enters his life, crying at the idea of finding another living person. Without asking, he decides to move in. In doing so, he turns his host's usually peaceful existence upside down. Elvis CDs replace Mozart. "Death Wish" on DVD replaces literary classics.
Gibson can stand it no more. He takes a gun from a bombed-out sporting goods store and forces Gallagher to leave.
Later, with any evidence of the other man gone, Gibson hears the noise of the unhooked door blowing in the wind. As he goes to fix it, he slips on a DVD case and falls down the stairs. On the landing, he finds that he cannot move and that he is bleeding from a nasty head wound. He calls for help from "anyone" - even Gallagher.
However, his old roommate is wandering the city's burned-out remains, too far away from Gibson to hear anything.