Magnum, P.I. (1980): Season 2, Episode 20

2 - 20: The Last Page

A Vietnam veteran, whom Magnum distantly knows from a mission they both served on during the war, hires him to supposedly find his missing girlfriend. Unbeknownst to Magnum, the man actually has an ulterior motive and is using him to track down an old adversary with whom he has an old score to settle.