Full Fight Download: Watch Mackenzie Dern's MMA Debut Oct 14, 2016 Comments Watch Mackenzie Dern's mixed martial arts debut at Legacy 58. Dern returns to the Legacy cage Friday night on AXS TV Fights. Related Articles By the Numbers: UFC Fight Night 161The Walkmen: All UFC Fight Night 161 Walkout Tracks5 Things You Might Not Know About Mackenzie Dern10 October Tussles Worth WatchingPictures: Metamoris 2 Pro Jiu-Jitsu Invitational