Season
- Season 0 1970-01-01
- Season 1 2004-09-04
- Season 2 2005-08-20
- Season 3 2006-08-19
- Season 4 2007-08-18
- Season 5 2008-08-16
- Season 6 2009-08-22
- Season 7 2010-08-21
- Season 8 2011-08-20
- Season 9 2012-08-18
- Season 10 2013-08-31
- Season 11 2014-08-30
- Season 12 2015-08-25
- Season 13 2016-08-27
- Season 14 2017-09-02
- Season 15 2018-08-31
Season 15 Episode
- Season 4 Series 4 - Auditions 1
- Season 4 Series 4 - Auditions 2
- Season 4 Series 4 - Auditions 3
- Season 4 Series 4 - Auditions 4
- Season 4 Series 4 - Auditions 5
- Season 4 Series 4 - Auditions 6
- Season 4 Boot Camp - 1
- Season 4 Boot Camp - 2
- Season 4 Boot Camp - 3
- Season 4 Boot Camp - 4
- Season 4 Elimination - 1
- Season 4 Elimination - 1 (Results)
- Season 4 Elimination - 2
- Season 4 Elimination - 2 (Results)
- Season 4 Elimination - 3
- Season 4 Elimination - 3 (Results)
- Season 4 Elimination - 4
- Season 4 Elimination - 4 (Results)
- Season 4 Elimination - 5
- Season 4 Elimination - 5 (Results)
- Season 4 Elimination - 6
- Season 4 Elimination - 6 (Result)
- Season 4 Elimination - 7
- Season 4 Elimination - 7 (Result)
- Season 4 Elimination - 8
- Season 4 Elimination - 9 (Result)
- Season 4 The Final
- Season 4 The Final (Results)
The X Factor - Season 4 Episode 1 Series 4 - Auditions 1
5.08 48 minutes The show returns for it's fourth series with Dermot O'Leary as the new host. Hopefuls audition for the judges hoping to impress and make it through to the next stage of the competition. Simon decides that new judge Brian isn't working out on the show and decides to ask Louis Walsh to return as his replacement.
