Mutant turtles Leonardo, Donatello, Raphael and Michelangelo are trained in the art of ninjutsu. The four learn to rely on each other as they unravel the mystery of their existence and train to become the heroes they are destined to be.
The Team is rescued by a strange alien robot called the Fugitoid. (S4, ep 1)
When the Team crash lands on an ice moon along with the enemy, they must put their differences aside to survive. (S4, ep 2)
When Casey discovers a hypercube, he unleashes a 4th dimensional being: Wyrm. (S4, ep 3)
When Lord Dregg hires a bounty hunter to destroy the Turtles, the team flees to an abandoned space station only to find an even bigger threat. (S4, ep 4)
The Turtles race to find the first piece of the Black Hole Generator and find themselves on a planet of pure evil. (S4, ep 5)
Journey to the Centre of Mikey's Mind: When microscopic aliens invade Mikey's mind, the Turtles have to chase them through the strange world of Mikey's subconscious. (S4, ep 6)
The Turtles are captured and thrown into the Triceraton Arena! (S4, ep 7)
The Turtles have to gain the trust of the Utrom Council to find the next piece of the Black Hole Generator. (S4, ep 8)
The Turtles journey through an ocean-like area of space. (S4, ep 9)
The Turtles are transported to another dimension, where they meet their '80s alternate-reality counterparts. (S4, ep 10)
Donatello is feeling inferior to Fugitoid, but his intellect is put to the test when the Triceratons attack! (S4, ep 11)
When Raph loses his fighting mojo, he must overcome his feelings to save his brothers from certain doom. (S4, ep 12)
The team must overcome impossible odds to acquire the final Black Hole Generator piece. (S4, ep 13)
As the team finally reaches Earth in a last ditch effort to save it, Fugitoid reveals a horrible secret about his past. (S4, ep 14)
When April graduates to full Kunoichi, she faces a deadly new enemy, while the Turtles face the return of some old, dangerous foes. (S4, ep 15)
When Leonardo secretly allies himself with Karai, he gets himself into deeper danger than he could have ever realized. (S4, ep 16)
The team faces Stockman-Fly's new insect minions, and Raph has to man up to overcome his fear of insects and lead the team. (S4, ep 17)
Don Vizioso's gang tracks the Turtles with a slew of Anti-Mutant weapons! (S4, ep 18)
Mikey befriends two odd new Superheroes. (S4, ep 19)
For the first time, the Turtles encounter something they cannot defeat - the Super Shredder! (S4, ep 20)
The Turtle team hunts for their Sensei, but soon realise they are being hunted as well. (S4, ep 21)
A concerned Donnie tests April to discover her psychic abilities are rapidly growing in power. (S4, ep 22)
Tokka Vs The World: Raph's bonding with little Chompy is interrupted by the invasion of Tokka, who has come to Earth searching for him. (S4, ep 23)
A mysterious new enemy with superhuman speed is on the hunt for Tiger Claw, and will take out whoever stands in her way. (S4, ep 24)
Splinter must lead the Turtles and the Mighty Mutanimals on the hunt to defeat his old enemy. (S4, ep 25)
The Turtles realize they must stop Shredder... and end this conflict once and for all. (S4, ep 26)