The one where Mr. Hankey comes to South Park is my favourite
The one with the many songs i didn't seen yet
The one with The Woodland Critters is depressing
And the one in wich Kyle comes to "save" Ike just shows that before season 12 Ike forgets from where he is and it thinks that is wrong for an adopted child to know more about his birth family and about the place from where he/she is,so that's why i'd rather miss that episode