The X Factor (UK): Season 11, Episode 9

11 - 9: Series 11 - Boot Camp 1

The successful acts that have made it through the auditions return for boot camp stage of the competition at London's Wembley Arena. The judges are given the categories they will be mentoring at the beginning of the show. The contestants then meet their mentors before the eliminations get underway. Half of the one hundred solo acts are eliminated as they are grouped in threes within their category and the groups paired up in so-called Sing Offs. After they have performed the acts learn whether they have made it through or are being sent home.