Season 4
The Teenage Mutant Ninja Turtles are back in an all-new animated series on Nickelodeon! Surfacing topside for the first time on their fifteenth birthday, the titular turtles, Leonardo, Michelangelo, Raphael and Donatello, find that life out of the sewers isn't exactly what they thought it would be. Now the turtles must work together as a team to take on new enemies that arise to take over New York City.
01. Beyond the Known Universe
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02. The Moons of Thalos 3
The Turtles and their enemy crash-land on an ice moon and they must put aside their differences in order to survive.
03. The Weird World of Wyrm
Casey releases a wish-granting alien named Wyrm, who wants his freedom to do whatever he wants to the universe
04. The Outlaw Armaggon!
A shark-like bounty hunter is hired by Lord Dregg to destroy the turtles, who choose to hide out in an abandoned space station.
05. Riddle of the Ancient Aeons
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06. Journey to the Center of Mikey's Mind
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07. The Arena of Carnage
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08. The War for Dimension X
The Turtles must gain the trust of the Utrom Council in order to find the next piece of the black hole generator.
09. The Cosmic Ocean
The Turtles journey through an ocean-like area of space.
10. Trans-Dimensional Turtles
The Turtles are transported to another dimension where they meet their 1980s counterparts and work together to battle Krang.
11. Revenge of the Triceratons
Donatello is feeling inferior to Fugitoid, but his intellect is put to the test when the Triceratons attack.
12. The Evil of Dregg
When Raphael loses his fighting mojo, he must overcome his feelings to save his brothers from certain doom.
13. The Ever-Burning Fire
The team must overcome impossible odds in order to obtain the final Black Hole Generator piece that is located on the planet Magdomar.
14. Earth's Last Stand
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15. City at War
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16. Broken Foot
When Leonardo secretly allies himself with Karai, he gets himself into deeper danger than he could have realized.
17. The Insecta Trifecta
Raphael must overcome his fear of insects to lead the team when they are forced to battle Stockman-Fly's new insect minions.
18. Mutant Gangland
Don Vizioso's gang tracks the Turtles with a slew of Anti-Mutant weapons.
19. Bat in the Belfry
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20. The Super Shredder
For the first time, the Turtles encounter something they cannot defeat – the Super Shredder!
21. Darkest Plight
The Turtle team hunts for their Sensei, but soon realizes they are being hunted as well.
22. The Power Inside Her
Donatello becomes concerned and decides to test April, only to discover that her psychic abilities are rapidly growing in power.
23. Tokka vs. the World
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24. Tale of Tiger Claw
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25. Requiem
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26. Owari
With the demise of their beloved father and Karai incapacitated, the Turtles, April, and Casey, infiltrate Super Shredder's new lair to put an end to Oroku Saki once and for all, no matter what it takes.