Shredder first appeared in the end of "Rise of the Turtles, Part 2" where he traveled to New York when he learned that Hamato Yoshi is training his own ninjas after seeing a shuriken with his clan symbol on a shuriken left behind by the Turtles during a recent fight on a TV news report. Determined to finally end his age-old rival's life, he sent the Foot Clan after the Turtles until he made his first confrontation with the Turtles in person in "The Gauntlet", where victory was seemingly in his grasp before he was distracted by the mutating Bradford and Montes. Although Shredder planned to kill former TCRI inventor Baxter Stockman for interfering with his plans to kill the Turtles in "MOUSERS Attack", he changed his mind by commenting on how Stockman's scientific knowledge could be useful to him. Shredder is also Karai's father, as seen in "New Girl in Town". However, in "Showdown", during Shredder's battle with Splinter, he reveals that in the aftermath of the fight that caused Tang Shen's death, he took Splinter's daughter, Miwa, and raised her as Karai. He has told her that he is her biological father and it was Splinter who killed her mother, as she has sworn revenge ever since. Shredder initially dismissed the Kraang's presence in New York, but after capturing one, decided to ally with them to destroy the Turtles. The partnership seems stable, though it would seem the Shredder still did not fully trust his new allies.