Famous cameos

As it was one of the biggest shows on the air, it's no wonder that swathes of celebrities lined up to cameo in 'Magnum P.I.'.

Over the years, the series has seen plenty of guest stars, including Frank Sinatra, Ian McShane, Sharon Stone and Orson Welles.

In fact, 'Magnum P.I.' contains one of Orson's last performances.

For just five episodes, Orson provided the voice of Robin Masters – the mysterious novelist who allows Magnum to live on his luxury estate in exchange for his security secrets.