Dermot O'Leary introduces the results from yesterday's semi-finals, and reveals which acts have been chosen to go through to the final by the viewing public and judges Simon Cowell, Louis Tomlinson, Ayda Williams and Robbie Williams, returning to the show after a three-week break. Plus, a musical performance from a special guest star.
s15e01 - Auditions 1
s15e02 - Auditions 2
s15e03 - Auditions 3
s15e04 - Auditions 4
s15e05 - Auditions 5
s15e06 - Auditions 6
s15e07 - Auditions 7
s15e08 - Auditions 8
s15e09 - Six Chair Challenge 1
s15e10 - Six Chair Challenge 2
s15e11 - Six Chair Challenge 3
s15e12 - Judges' Houses 1
s15e13 - Judges' Houses 2
s15e14 - Judges' Houses 3
s15e15 - Live show 1
s15e16 - Live show 2
s15e17 - Live Show 2
s15e18 - Live Show 2 Results
s15e19 - Live Show 3
s15e20 - Live Show 3 Results
s15e21 - Live Show 4
s15e22 - Live Show 4 Results
s15e23 - Live Show 5
s15e24 - Live Show 5 Results
s15e25 - Live Semi-Finals
s15e26 - Live Semi-Finals Results
s15e27 - Live Finals: Top 3 Perform
s15e28 - Live Finals: Winner Announcement
Each X Factor judge is in charge of a different section of singers on the show. The judges do not know what section of the competition they will be in charge of until the audition process has finished. Each judge then has to pick four acts to take forward to the live section of the show. Each week the two acts with the lowest amount of public votes have to sing again in a final showdown after which the judges decide who should be eliminated. Once there are only five acts left remaining it becomes left to the public to decide who should go.