MacGyver Boss: Tweak to Series Finale Revealed Romantic 'Endgame' — Plus, How Season 6 Would Have Kicked Off TVLine 1/05/2021 aka its Season 5 and series (at least on CBS) finale. MacGyver has folded open his last Swiss Army knife. More from TVLine series finale, at least one accomodation was made to honor the lead character’s past and strongly hint at his future. To briefly recap Friday’s episode: Mac and Riley (played by Lucas Till and Tristin Mays) went missing for 24 hours, and had no memory of what happened to them during that disappearance. It was discovered that they had been experimented on, since the nanobots still in their system apparently allow for a degree of mind control. Worse, Matty (Meredith Eaton) came to realize that none other than the