The premiere of episodes 52 â `` 61 ( episodes 12-21 of Book 3 : Fire throughout the week of Sozin 's Comets release received over 19 million views , of which 5.6 million were from the premiere of Sozin 's Comet . The premiere of episodes 52 â `` 61 throughout the week of Sozin 's Comets release received over 19 million views , of which 5.6 million were from the premiere of Sozin 's Comet .