What did everyone think of the Mutant Apocalypse arc? I thought it was great and sad at some parts. Especially Leonardo and the turtles reunite after almost 50 years. I always wondered where mutagen bomb came from? A failed EPF experiment that went rogue? The Kraang returned and accidently destroyed New York? I guess we will never know. We will never know if April or Karai ended up with Donatello or Leonardo.