Totally the huge fight between the good and evil, best fight scene ever!! I just loved all the action and everything that happened between the two sides C:
I also loved how M and R brought back the rest of the casts memories, especially Benson's memory, I just loved it!
My favorite part definitely had to be where Skips regained his memories after Rigby said something like "we know why your name is Skips" and "Remember The First Woman You Loved?" I loved that part.