In the following years, Saki took leadership of the Foot Clan, and took on his Shredder persona. He also met a trans-dimensional alien called Krang, and used the advanced technology at his disposal to replace the Foot Ninja with robots called the Foot Soldiers. He secretly moved to New York, where he found Yoshi still alive. In an attempt to kill his old foe, Shredder dumped mutagen in the sewers. This mutates Yoshi into Splinter, and he starts training the also mutated Turtles in ninjutsu. After the Turtles discovered his operation in New York City, Shredder became their enemy and would stop at nothing until they were defeated. In one episode, Shredder was accidentally hit by his lasted weapon that made him think he was pals with the Turtles as he thought he was Michelangelo. However, Shredder was hypnotized by Splinter into going between his real personality and Michelangelo whenever he would hear their names. Although, after being hit again, Shredder was back to his old self, which might have undone the hypnosis.