Board Thread:Questions and Answers/@comment-28044747-20160327085254/@comment-24463671-20160408134318

Here is what I see happening. Maybe Dregg and the Triceratons have formed an alliance and have the complete Heart of Darkness. They intend to use it on Earth, not just for it being the Kraang's hiding spot, but to also punish the Turtles for their interference.

To stop this from happening; the Turtles gather all the allies they have made while in space: The Salamandrians (Mona Lisa and Sal Commander), the Utroms (with Bishop), the Daagon, maybe the Aeons, and Zeno. Together, they launch an assault on the enemy to destroy the Heart of Darkness once and for all.

Maybe in the end, Professor Honeycutt sacrafices himself to destroy the Heart of Darkness (not unlike the 2003 series).

That's my theory.