In the four part "Finale" episode, more of Shredder's backstory was revealed where Oroku Saki had the Kuroi Yōroi forged to be mystical and unstoppable by a hideous Oni. When the Turtles and Splinter head to the Twilight Realm to get a weapon that would beat the Shredder, it also enabled him to regain his power of speech as he leads the Foot Clan into attacking the Turtles. They managed to beat the Turtles and make off with Splinter and Baron Draxum. Using Baron Draxum's laboratory in the Hidden City, Shredder gets the information he needs. A brief fight between Shredder and Baron Draxum collapses part of the laboratory. The cave-in traps the Foot Lieutenant and the Foot Brute as Shredder tells the Foot Recruit to leave them while making her his general. Thanks to information from a recuperating Big Mama, the Turtles and April were able to head to the Crying Titan where Shredder is planning to harness the Empyrean so that he can extract Splinter's essence. With help from a defecting Foot Recruit, the Turtles and April free Splinter and Baron Draxum. The group combines their strengths with the spirits of Splinter's ancestors to defeat the Shredder while reuniting Oroku Saki's spirit with the Hamato Clan's spirits.