Watch Marathon Man (1976) (1976) HD Full Movie Free on solarmovie.do. Watch Marathon Man (1976) (1976) online free. After the shocking murder of his older brother, a New York history student finds himself inexplicabl...After the shocking murder of his older brother, a New York history student finds himself inexplicably hounded by shadowy government agents on the trail of a Nazi war criminal who is trying to retrieve smuggled diamonds.