As mixed martial arts fans around the globe get ready for next weeks matchup of Conor McGregor vs. Dustin Poirier, UFC has released a new installment of their Countdown series highlighting the first contest between the two Lightweight fighters six years ago. Moving on to their careers up to this point including McGregor becoming the first two-weight UFC champion and Poirier become the interim Lightweight Champion and a mainstay of the top of the division. Watch the full Conor McGregor vs. Dustin Poirier II Countdown feature below now.