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.
Rise of the Turtles - Part 1: Splinter allows the Turtles to visit the surface for the first time, where they try to stop some thugs trying to kidnap April O'Neil and her parents. (S1, ep1)
Rise of the Turtles - Part 2: The Turtles discover a mysterious canister of mutagen, and realise that the kidnapping mystery is much bigger than they ever imagined. (S1, ep2)
Raphael loses his temper, blowing a mission and getting caught on video. Can he learn to control his rage and get the video before it falls into the wrong hands? (S1, ep3)
To prove that Turtles can be friends with humans, Michelangelo uses a website to befriend a famous martial artist who is secretly Shredder's top lieutenant. (S1, ep4)
Donatello uses a military chip to create a self-upgrading mp3 player. Which is great - until Michaelangelo drops it, and Baxter finds it. (S1, ep5)
Weary of using his simple bo staff to fight the technologically advanced Kraang, Donatello creates Metalhead, a remote-controlled robot turtle to fight in his place. (S1, ep6)
When Donatello and April investigate a scientist's disappearance, they encounter a psychic monkey, and the Turtles learn that some battles are won in the mind. (S1, ep7)
Leo fears his act of mercy has come back to haunt him when Xever holds a local noodle shop owner and new friend of the Turtles, Yuen, hostage. (S1, ep8)
April and the Turtles attempt to save her dad, but they have to confront Shredder himself, who's taken the job of destroying the Turtles into his own hands. (S1, ep9)
The Turtles regain their confidence when they must save April and defend their home from the mutant Bradford and Xever, who aim to destroy the sewers with chemicals. (S1, ep10)
Threats from the Purple Dragon gang and Baxter Stockman's Mousers force the Turtles to split. Donnie and Mikey must prove they're as valuable as Leo and Ralph. (S1, ep11)
Michelangelo befriends an unstable mutant alligator who possesses Kraang technology, but the other Turtles aren't sure whether "Leatherhead" is a friend or a foe. (S1, ep12)
The Turtles must face off against a new enemy, The Rat King, who threatens not only to take control of the city, but Splinter's mind as well. (S1, ep14)
Leonardo lets Raphael try his hand at leadership. Leonardo meets a beautiful and dangerous Kunoichi who tries to lure him to the dark side. (S1, ep13)
Raphael warns Leo that keeping Karai a secret puts the Turtles in jeopardy - which proves true when she interferes with the Turtles' investigation. (S1, ep 15)
When Donnie takes "The Badger" under his wing, the positive hero helps the Turtles defeat Fishface, but also reveals the location of the power cell to the Kraang. (S1, ep16)
While breaking into the hostile environment of TCRI headquarters, the Turtles discover the true intent of the Kraang, and try to stop the alien invasion once and for all. (S1, ep17)
As the Turtles try to foil a Kraang invasion plot, they are hunted by a giant, indestructible cockroach, forcing Raph to confront his roach phobia. (S1, ep18)
Fed up with Fishface, Dogpound and the Turtles, Baxter Stockman lures them into a deadly labyrinth. To survive, each must join forces with their enemies. (S1, ep19)
Enemy of My Enemy : After witnessing the Portal in action, Karai sees the seriousness of the Kraang threat and approaches the Turtles to propose an alliance. (S1, ep20)
While the Turtles are infiltrating a Kraang base, the Foot Clan attempts to capture April, forcing her to fend for herself in a battle of wits against Karai. (S1, ep21)
Pulverizer Returns: When Shredder schemes to create a fearsome army of mutants, the Turtles have to rely on the help of the newest recruit to the Foot Clan: The Pulverizer! (S1, ep12)
After Leonardo, Raphael, and Donatello fall under the control of a parasitic Wasp, Michelangelo must fight his brothers to save them. (S1, ep23)
The Turtles break into a Kraang detention center to rescue Kirby O'Neil. When they get trapped inside, they realize that breaking in was the easy part. (S1, ep24)
Showdown - Part 1: As the Turtles make an assault on TCRI to shut down the portal, April is kidnapped by Shredder and to save her, Splinter must finally confront his old nemesis! (S1, ep25)
Showdown - Part 2: Leonardo must risk the ultimate sacrifice in order to save his brothers, rescue April and stop the Kraang from using their now perfected formula. (S1, ep26)