CBS's Friday night lineup is back! In this behind-the-scenes preview, the casts of MacGyver, Magnum PI & Blue Bloods preview their season premieres and talk about how it feels to be back in production. The new seasons of MACGYVER, MAGNUM P.I. and BLUE BLOODS debut at 8:00 PM, 9:00 PM and 10:00 PM, respectively, Friday, December 6 on CBS.