The BEST episodes of The X Factor season 15

#1 - Live Show 1

Season 15 - Episode 15 - Aired 10/20/2018

Dermot O'Leary hosts the first of the live shows. The remaining 16 acts will perform to impress judges Simon Cowell, Louis Tomlinson, Robbie Williams and Ayda Williams - as well as the viewing public at home. This year, Simon will be coaching the Girls, Louis has the Boys, Robbie will take on the Groups and Ayda has the Overs.

#2 - Live Finals: Winner Announcement

Season 15 - Episode 28 - Aired 12/2/2018

Dermot O'Leary hosts the final of the talent contest. The remaining acts get one last chance to make a good impression on the viewing public and judges Simon Cowell, Louis Tomlinson, Ayda Williams and Robbie Williams, and win the coveted title of this year's winner. Last in the series.

#3 - Live Finals: Top 3 Perform

Season 15 - Episode 27 - Aired 12/1/2018

Weeks of lively auditions, gruelling boot camps and tense on-stage showdowns draw to a close with the first instalment of the talent show's grand final. Before the winner is announced, the remaining acts face another stand-off, as the judges deliver their verdict on each act's performance. As ever though, their decisions are not the only thing that will determine who emerges as this year's champion, with the public vote to follow. Plus, a selection of guest stars also take to the stage to help send this year's contest off in style.

#4 - Live Semi-Finals Results

Season 15 - Episode 26 - Aired 11/25/2018

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.

#5 - Live Semi-Finals

Season 15 - Episode 25 - Aired 11/24/2018

Dermot O'Leary presents the semi-finals, with the remaining contestants hoping to win a place in next week's final by impressing the judges, including Robbie Williams, who returns having been on tour in South America in recent weeks.

#6 - Live Show 5 Results

Season 15 - Episode 24 - Aired 11/18/2018

Dermot O'Leary introduces the results from the fifth week of the live shows, and reveals which acts have made the best impression on the viewing public as wells as Simon Cowell, Louis Tomlinson, Ayda Williams, and this week's special guest judge. Plus, a musical performance from a special guest star.

#7 - Live Show 5

Season 15 - Episode 23 - Aired 11/17/2018

Dermot O'Leary hosts the fifth week of live shows. The remaining acts will be keen to impress judges Simon Cowell, Louis Tomlinson and Ayda Williams - as well as the viewing public - and escape elimination in tomorrow night's results show. Ayda's husband and Groups mentor Robbie Williams is due to return to the judging panel next week, having missed several recent shows due to touring commitments in South America, so tonight will see a guest stepping into the former Take That star's shoes once again.

#8 - Live Show 4 Results

Season 15 - Episode 22 - Aired 11/11/2018

Dermot O'Leary introduces the results from the fourth week of the live shows, and reveals which acts have made the best impression on both judges Simon Cowell, Louis Tomlinson, Nile Rodgers and Ayda Williams, and the viewing public. Plus, a musical performance from a special guest star.

#9 - Live Show 4

Season 15 - Episode 21 - Aired 11/10/2018

Dermot O'Leary hosts the fourth week of live shows. The remaining 14 acts will be keen to impress judges Simon Cowell, Louis Tomlinson, Ayda Williams and Nile Rodgers - still filling in for the absent Robbie Williams - as well as the viewing public - and escape elimination in tomorrow night's results show.

#10 - Live Show 3 Results

Season 15 - Episode 20 - Aired 11/4/2018

Dermot O'Leary introduces the results from the third week of the live shows, and reveals which acts have made the best impression on both judges Simon Cowell, Louis Tomlinson, Robbie Williams and Ayda Williams, and the viewing public. Plus, a musical performance from a special guest star.

#11 - Live Show 3

Season 15 - Episode 19 - Aired 11/3/2018

Dermot O'Leary hosts the third week of the singing contest's live shows, with the remaining acts keen to impress the judges as well as the viewers who will be casting votes for their favourite - with tomorrow night's results show revealing which acts have proved a hit and who will be leaving the contest this week. This year, Simon Cowell is in charge of the Girls, Louis Tomlinson has the Boys, Ayda Williams has the Overs, and Robbie Williams puts his Take That background to good use in coaching the Groups.

#12 - Live Show 2 Results

Season 15 - Episode 18 - Aired 10/28/2018

Dermot O'Leary hosts the Sunday night results show, with judges Simon Cowell, Louis Tomlinson, Robbie Williams and Ayda Williams assessing the previous episode's performances. Plus, a special musical guest star will be performing on the show.

#13 - Live Show 2

Season 15 - Episode 17 - Aired 10/27/2018

Dermot O'Leary hosts the second week of live shows, with the remaining acts performing to impress judges Simon Cowell, Louis Tomlinson, Robbie Williams and Ayda Williams - as well as the viewing public at home. This year, Simon will be coaching the Girls, Louis has the Boys, Robbie will take on the Groups and Ayda has the Overs.

#14 - Live Show 1 Results

Season 15 - Episode 16 - Aired 10/21/2018

Dermot O'Leary hosts the second of the live shows. The 16 acts selected from the auditions will perform to impress judges Simon Cowell, Louis Tomlinson, Robbie Williams and Ayda Williams - as well as the viewing public at home. This year, Simon will be coaching the Girls, Louis has the Boys, Robbie will take on the Groups and Ayda has the Overs.

#15 - Auditions 1

Season 15 - Episode 1 - Aired 9/1/2018

Contestants audition in the Wembley SSE Arena before this season's new panel of judges: Robbie Williams, Ayda Williams, Louis Tomlinson, and Simon Cowell. Dermot O’Leary returns as host.

#16 - Judges’ Houses 3

Season 15 - Episode 14 - Aired 10/14/2018

#17 - Judges’ Houses 2

Season 15 - Episode 13 - Aired 10/13/2018

The remaining 24 acts travel to glamorous destinations across the world and have just one more chance to impress their mentors as the live shows draw tantalisingly closer. Each of the regular judges will be joined by a guest who knows all about what it takes to make it in the industry, to help them decide which of the contestants make the cut.

#18 - Judges' Houses 1

Season 15 - Episode 12 - Aired 10/7/2018

The remaining 24 acts jet off to the Judges' Houses stage. Offering a glimpse into the jetset lifestyle that the winner could have, the contestants travel to glamorous destinations across the world, and with just one more chance to impress their mentor, each act will be hoping to convince them that they have the star quality required to reach the live shows.

#19 - Six Chair Challenge 3

Season 15 - Episode 11 - Aired 10/6/2018

The final Six Chair Challenge episodes, in which the acts perform individually before the judges choose who will be selected for the next stage.

#20 - Six Chair Challenge 2

Season 15 - Episode 10 - Aired 9/30/2018

The 2nd Six Chair Challenge episode, in which the acts perform individually before the judges choose who will be selected for the next stage.

#21 - Six Chair Challenge 1

Season 15 - Episode 9 - Aired 9/29/2018

The Six Chair Challenge returns, as the judges each decide on the acts they take through to their Judges' House. This year each judge has a golden button, which guarantees one act in their line-up a place in the final 6, meaning that once they have a seat, they cannot be swapped out.

#22 - Auditions 8

Season 15 - Episode 8 - Aired 9/23/2018

It's the final night of auditions.

#23 - Auditions 7

Season 15 - Episode 7 - Aired 9/22/2018

#24 - Auditions 6

Season 15 - Episode 6 - Aired 9/16/2018

#25 - Auditions 5

Season 15 - Episode 5 - Aired 9/15/2018