Reba McEntire will join the upcoming Season 23 of NBC's The Voice as "Mega Mentor," to mentor the remaining artists who have made it through the Battle Rounds as each team prepares for the Knockouts that begin in April. The new season of The Voice premieres on Monday, March 6th.  Reba previously served as Battle Advisor to Team Blake during the show’s first season. This is Blake's last season on the show.