Season Seven of Magnum, P.I comes to spectacular conclusion--one that was originally intended to be the series' final episode. Wounded in a violent shootout, the comatose Magnum (Tom Selleck) hovers between life and death. From his vantage point in "Limbo", Magnum tries to communicate with his friends, to warn them that his ex-wife Michelle may soon be murdered. Coming to Magnum's rescue--in a manner of speaking--is the spectre of his old Navy buddy "Mac" MacReynolds (Larry Manetti). Though Magnum, P.I. had indeed been cancelled at the end of its seventh season, the series was brought back the following year by public demand--necessitating a hasty "rethinking" of this episode's now-famous closing image.
by Hal Erickson synopsis