“The Ultimate Fighter” is back for a 31st season, which will be coached by lightweight stars Conor McGregor and Michael Chandler . Set to debut May 30 on ESPN and run until Aug. 15, the series will include men’s bantamweights and lightweights, as first reported on MMA Junkie’s “Spinning Back Clique.” Filming began in February in Las Vegas. McGregor (22-6 MMA, 10-4 UFC) and Chandler (23-8 MMA, 2-3 UFC) will square off after the conclusion of the series at a date and location yet-to-be-determined. In addition to an announcement of rosters Saturday, the promotion announced the upcoming season will have a theme of “Redemption,” which pins former UFC fighters against rising prospects.