As the TMNT continue to train under the tutelage of the Shredder in Northampton, the techniques they are learning take a bizarrely arcane turn. Will Michelangelo, Donatello, Raphael, Leonardo, and Jennika learn how to master and control the dark ninja arts-or will they be consumed by them? One thing's for certain: if they are to have any chance at success, they will need to seek out a light from the past to help guide their way.