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