Casey Jones Steps Up and takes on pure evil. Meanwhile, the Turtles learn a shocking secret about April's past, and they come face-to-face with another mutant turtle called Slash, a rewired Metalhead, a fungus mutant spreading through the sewers, and the Rat King!
Episodes Comprise: 6. Target: April O'Neil
7. Slash and Destroy
8. The Kraang Conspiracy
9. The Good, the Bad and Casey Jones
10. Fungus Humungous
11. Metalhead Rewired
12. Of Rats and Men