Wrath of the Rat King (S08E02)

Title: Revenge of the Rat King Plot: Burne sets up a hotline for anyone who witnesses the culprits behind the devastation of the Channel Six News Building. Meanwhile, in the Hall of Science, Shredder grows increasingly anxious that the Turtles might discover a way into the facility. To counter this threat, he seeks assistance from an old ally lurking in the sewers: the Rat King!