eliminated (no final showdown) Sebastian was not required to vote as there was already a majority. Live show details Week 1 (27/29 September) Theme: Launch Party Group performance: "Gold Dust" Celebrity performers: Jessica Mauboy ("This Ain't Love") and Justin Bieber ("What Do You Mean?") Judges' vote to eliminate Minogue: Dan Hamill – backed her own act, Georgia Denton. Blunt: Georgia Denton – backed his own act, Dan Hamill. Isaak: Dan Hamill – wanted to see what Denton was going to do next. Sebastian: Dan Hamill – thought Denton still had more to deliver. Notes This week's live performance show aired on Sunday night due to the Seven Network's coverage of the 2015 Brownlow Medal on Monday night. Week 2 (5/6 October) Theme: Decades Challenge Group performance: "Up" Celebrity performers: Monday: One Direction ("Drag Me Down") Tuesday: Ellie Goulding ("On My Mind") and Robbie Williams ("Angels") Judges' vote to eliminate Minogue: The Fisher Boys – felt that Jess and Matt has develop more. Blunt: The Fisher Boys – felt that The Fisher Boys went too far that week. Isaak: The Fisher Boys – thought Jess & Matt had the X Factor. Sebastian was not required to vote as there was already a majority and did not say how he would have voted as both acts were in his category. Notes A video of One Direction's performance of "Drag Me Down" from their On the Road Again Tour was shown on Monday night. On 17 October 2015, the performances of three contestants entered the ARIA Singles Chart. Cyrus Villanueva's performance of "Wicked Game" debuted at number 6, Mahalia Simpson's performance of "Hello" debuted at number 88, and Louise Adams' performance of "People Help the People" debuted at number 91. Week 3 (12/13 October) Theme: Top 10 Hits Group performance: "Rather Be" Celebrity performers: Jess Glynne ("Don't Be So Hard on Yourself"), Chris Isaak ("Please Don't Call"), and Little Mix ("Love Me Like You") Judges' vote to eliminate Isaak: Mahalia Simpson – backed his own act, Jimmy Davis. Minogue: Jimmy Davis – backed her own act, Mahalia Simpson. Blunt: Jimmy Davis – felt that Simpson was fantastic despite being a threat to the contestants in his category. Sebastian: Jimmy Davis – felt that Simpson had more magical performances in the live shows. Notes For the first time in the show's history, this week's live decider featured a double elimination. For the second time