Rise of the TMNT: Season 3

It's been less than a year since the defeat of the Kraang, and the Turtles are still managing what they've been through. Mikey is trying harder than ever to keep the family together, Raph is afraid of returning to his "kraang-zombie" state, Donnie is learning how to express his emotions properly, and Casey Jones Jr is still adjusting to this past version of his home. However, Leo is the one who was most affected by the near invasion. And he blames himself for every horrible thing that did and could've happened because of his stupid ego. He's been having nightmares of the Kraang returning and what would have happened if he had failed to save his family. And he hates himself so much for letting the Kraang nearly kill his family in the first place. Not only this, but he becomes more stern of a leader, more harsh and ruthless towards his enemies. It only gets worse, as he gets himself kidnapped by Big Mama, forced to fight in her New Battle Nexus. But while there, he discovers more about Big Mama's assistant, discoveries that would change him and his family forever.