Maybe it was the setting in the sun-splashed digs of Oahu, Hawaii. Maybe it was the cushy gig of patrolling a 200-acre beachfront estate. Or maybe it was all the cool cars. But who are we kidding? Tom Selleck provided the high-voltage appeal to the Emmy-winning CBS series Magnum, P.I. that kept TV viewers throughout the ’80s tuning in on Thursday (later Wednesday) nights. Costar John Hillerman played the caretaker of Robin’s Nest whose by-the-book style was frequently at odds with Magnum’s more easygoing methods. (Hillerman passed away in late 2017.)