Премьера: 23 Ноября 2019 Главные продюсеры: Andy Suriano, Ant Ward Продюсер: Vladimir Radev Сценарий: Ian Busch Режиссёры: Kevin Molina-Ortiz, Sebastian Montes Художники-раскадровщики: Jake Castorena, Alicia Chan, Phil Jacobson, Kevin Molina-Ortiz, Samuel Montes
Персонажи второго плана: Baron Draxum (Roger Craig Smith), Big Mama's assistant (debut), Big Mama's soldiers (debut), Evil Six (debut), Foot Clan, Foot Brute (Maurice LaMarche), Foot Lieutenant (Rob Paulsen), Foot Recruit (Zelda Williams), Fox Bellhop (Eric Bauza), Kraken (debut), Serge (Rob Paulsen, debut)
Черепашкам-ниндзя очень нужно остановить упорного врага, пытающегося разрушить Нью-Йорк, но неприятности возникнут, когда ради достижения цели им придётся разделиться.
Оригинал сюжета на английском языке (спрятан под спойлер):
With the third part starting, the Shredder had been brought back to life. Baron Draxum realizes that the Foot Clan used him and wondered why. Foot Lieutenant tells him that they need an alchemist to build him and give the Shredder life. And when Draxum wore the armor, his life essence was drained. The Turtles are no match for the Shredder as the demon disappeared. Leo started to think they have to go head, but Splinter can't take it easy that quickly. But Leo says that they have to go ahead, although that annoys Raph because Leo thinks he is always serious.
The Turtles find Shredder at Albearto's pizzeria and the museum but the demon kept running away. Splinter suggests that they talk to Big Mama. Raph, Donnie, Mikey, and April O'Neil go after the Shredder while Leo forcibly teleports Splinter to the Grand Nexus Hotel.
At the hotel, Splinter tells Leo that Big Mama was his ex. Back then, during the production of the Lou Jitsu film Crouching Shrimp Hidden Tiger Prawn, Splinter met Big Mama who worked as a truck driver tasked to drive his trailer and he started to fall in love with her. One night when Splinter asked Big Mama to marry him, she kidnapped him to her Battle Nexus, forcing him to fight. They encountered Big Mama who takes them to a ring like bracelet. Leo tells her that Splinter will fight, much to Splinter's misery.
With Splinter inside the nexus was about to fight the monsters who was till annoyed to Leo, Big Mama says that she can alter things and took Leo's sword and dropped him in the Battle Nexus with Splinter. Leo took one of the mini teleporter coins and grabs his sword and helps his dad to fight the monsters.
They return to New York to meet the other Turtles who are worried but Leo says that they got this. Just in time, Shredder appears and Leo was about to put the collar on the Shredder, but Raph grabbed Leo's arm asking him that if he's sure he can put the collar on. Leo smiles and trusts him.
With their attacks down, Leo puts the collar on Shredder as the dark armor breaks. Big Mama vanquished the Shredder. And because of all this, the turtles and April fell asleep after all fighting for three days. Splinter has a task to take them home and let them sleep after everything had happen. Splinter tells her that they won't able to see each other.
After they left, Big Mama can still change now that she have the Shredder to do her evil deeds as the episode ends.