The Turtles begin training with the mysterious Ninja Tribunal, experimenting with new powers and weapons. After securing the first of the Tribunal’s Lost Artifacts, our heroes learn to their horror that the “great evil” they are destined to face is the long-imprisoned spirit of the one, true Shredder!

The Turtles train with the Ninja Tribunal to prevent the resurrection of the Shredder. But when Splinter and the Ancient One express serious doubts about trusting the Tribunal, the Turtles are confused. If they all agree on the goal, why the doubts? To explain the danger to the Turtles, Splinter and the Ancient One reveal the secret history of the Tribunal… including the true origin of the Shredder!

The Turtles and company continue their training under the Ninja Tribunal, learning to fight in the physical as well as mental and spiritual worlds. They’re going to need that knowledge, because the second artefact of the Shredder has been found, guarded by a horde of nasty Tengu demons that eat Acolytes for breakfast… literally!

The Justice Force is expanding its ranks, and Mikey plans on joining up as Turtle Titan!, while Leo is more concerned in alerting them to the threat of the original Shredder. But when Nano reappears (thanks to Bishop and Baxter Stockman), everything quickly spirals out of control into a super hero vs. nanotech slugfest! But has Nano come back as friend or foe? And will the Turtle Titan and Leo survive long enough to find out?

The original Shredder is resurrected by the Foot Mystics, whose first agenda is to destroy Karai – the “false Shredder.” And, while the Turtles are enemies of both Shredders, they realize that if the original Shredder wins, his goal of creating a world of destruction, devastation and chaos will be one huge step closer to reality. So, like it or not, they have to help Karai – even while she’s intent on killing them!

In their attempt to rescue Karai from the Foot Mystics and new Shredder, the Turtles wind up in a raging battle filled with magic and martial arts where they use everything the Tribunal taught them - but will it be enough to escape with Karai and their lives?

Weary after their first battle with the new Shredder, the Turtles doubt they can defeat him. To lift their spirits, Splinter and the Ancient One shares a tale of the Turtles’ toddler days. The story reveals that though the Turtles were small, they overcame impossible odds to defeat a phantom bent on reviving the Shredder, though they may not remember it.

Shredder begins to build a new dynasty in New York, transforming the whole island into a hellish nightmare.

The demonic Shredder has transformed New York City into a nightmare version of Feudal Japan and the rest of the modern world is next! But the Turtles have a plan, and if it takes allying themselves with some of their former enemies to bring the fight to the Shredder, so be it... because if they fail, all life as they known it will cease to exist.

With the help of their closest allies and most dangerous enemies alike, the Turtles have fought their way through a demonic version of New York to confront the Shredder once and for all! Now the Turtles must have everything they've got and have no choice but to focus their energy and become their very own mystic avatars...Dragons. This night, the Teenage Mutant Ninja Turtles will meet their destinies: Whether to live or die!