Currently available on 2 streaming services.

Streaming, rent, or buy Magnum, P.I. – Season 1:

You are able to buy "Magnum, P.I. - Season 1" on Apple TV, Microsoft Store as download.

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Cast

Tom Selleck
Thomas Magnum
John Hillerman
Jonathan Higgins
Roger E. Mosley
Terry "TC" Calvin
Larry Manetti
Rick Wright