Season 21 aired between 14 Sep 2015 and 24 Nov 2015, 14 episodes.
Episodes
E01
Week 1: Premiere
14 Sep 2015
E02
Week 1: First Dances
15 Sep 2015
E03
Week 2: Hometown Glory (1)
21 Sep 2015
E04
Week 2: Hometown Glory (2)
22 Sep 2015
E05
Week 3: TV Night
28 Sep 2015
E06
Week 4: Most Memorable Year
05 Oct 2015
E07
Week 5: The Switch Up
12 Oct 2015
E08
Week 6: Famous Dances
19 Oct 2015
E09
Week 7: Halloween Night
26 Oct 2015
E10
Week 8: Icons Night
02 Nov 2015
E11
Week 9: Showstoppers Night
09 Nov 2015
E12
Week 10: Semifinals
16 Nov 2015
E13
Week 11: Finals (1)
23 Nov 2015
E14
Week 11: Finals (2)
24 Nov 2015