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- Season 4 overviewOct 25, 2015-Feb 26, 201726 episodesSeason 4 episodes1. Beyond the Known Universe Oct 25, 2015
- The team meets a strange alien robot called the Fugitoid.
- 2. The Moons of Thalos 3 Nov 1, 2015
- When the team crashes on an ice moon along with the enemy, they must put their differences aside.
- 3. The Weird World of Wyrm Nov 8, 2015
- When Casey discovers a hypercube, he accidentally unleashes a fourth dimensional being called Wyrm.
- 4. The Outlaw Armaggon Nov 15, 2015
- When Lord Dregg hires a bounty hunter to destroy the turtles, the team flees.
- 5. Riddle of the Ancient Aeons Jan 10, 2016
- The Turtles find themselves on a planet of pure evil.
- 6. Journey to the Center of Mikey's Mind Jan 17, 2016
- The Turtles have to chase microscopic aliens through the strange world of Mikey's subconscious.
- 7. The Arena of Carnage Jan 24, 2016
- The Turtles are captured and thrown into the Triceraton Arena.
- 8. The War for Dimension X Jan 31, 2016
- The Turtles must gain the trust of the Utrom Council in order to find the black hole generator.
- 9. The Cosmic Ocean Mar 18, 2016
- The Turtles journey through an ocean-like area of space.
- 10. Trans-Dimensional Turtles Mar 27, 2016
- The Turtles are transported to another dimension where they meet their 1980s counterparts.
- 11. Revenge of the Triceratons Apr 3, 2016
- Donatello's intellect is put to the test when the Triceratons attack.
- 12. The Evil of Dregg Apr 10, 2016
- When Raphael loses his fighting mojo, he must overcome his feelings to save his brothers.
- 13. The Ever-Burning Fire Apr 17, 2016
- The team must overcome impossible odds in order to obtain the final Black Hole Generator piece.
- 14. Earth's Last Stand Apr 24, 2016
- As the team finally reaches Earth, Fugitoid reveals a horrible secret about his past.
- 15. City at War Aug 14, 2016
- April faces a deadly, new enemy when she graduates to full Kunoichi.
- 16. Broken Foot Aug 21, 2016
- When Leonardo secretly allies with Karai, he finds himself in danger.
- 17. The Insecta Trifecta Aug 28, 2016
- Raphael must overcome his fear of insects when the team battles Stockman-Fly's new insect minions.
- 18. Mutant Gangland Sep 4, 2016
- Don Vizioso's gang tracks the Turtles with a bunch of anti-mutant weapons.
- 19. Bat in the Belfry Sep 11, 2016
- Michelangelo befriends some odd, new superheroes named Wingnut and Screwloose.
- 20. The Super Shredder Nov 6, 2016
- For the first time, the Turtles encounter something they cannot defeat.
- 21. Darkest Plight Nov 13, 2016
- The Turtle team hunts for their Sensei, but soon realizes they are being hunted as well.
- 22. The Power Inside Her Nov 20, 2016
- Donatello decides to test April, only to discover that her psychic abilities are rapidly growing.
- 23. Tokka vs. the World Feb 5, 2017
- The invasion of Tokka interrupts Raphael's bonding with little Chompy.
- 24. Tale of Tiger Claw Feb 12, 2017
- A mysterious new enemy with superhuman speed hunts for Tiger Claw.
- 25. Requiem Feb 18, 2017
- Splinter must lead the turtles and the Mighty Mutanimals on the hunt to defeat his old enemy.
- 26. Owari Feb 26, 2017
- The Turtles realize they must stop Shredder, and end this conflict once and for all.