 The first part of " The Return of Harmony " aired on September 17 , 2011 and the second part aired on September 24 . The first part was viewed by over 339 @,@ 000 viewers , making it one of the highest @-@ rated episodes ever broadcast by The Hub . In addition , the first part received a 0 @.@ 2 Nielsen household rating in the United States , meaning that it was seen by 0 @.@ 2 percent of all households watching television at the time of the broadcast . The episode received a 0 @.@ 1 18 @-@ 49 rating , meaning that it was viewed by 0 @.@ 1 percent of all 18- to 49 @-@ year @-@ olds watching television at the time of broadcast . The episode was later beaten by " A Canterlot Wedding , " which scored a total viewership of 483 @,@ 000 and 475 @,@ 000 . 
