When Splinter allows his teenage sons, the Mutant Ninja Turtles, to visit the surface for the first time, they discover that the surface world isn't as simple as it first appears.

The turtles are caught on a mobile phone's camera and must retrieve it. This is complicated by the phone's obnoxious owner, who constantly provokes Raph into losing his temper.

To prove that Turtles can be friends with humans, Michelangelo uses a social networking site to befriend Chris Bradford, a famous martial artist.

When the Turtles sneak out against Splinter's wishes, they run afoul of Baxter Stockman, a deranged inventor in mechanical battle armor.

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.

Donatello and April investigate a scientist's disappearance, but discover a conspiracy regarding a bizarre psychic monkey instead.

Leo fears his act of mercy has come back to haunt him when Xever holds a local noodle shop owner hostage.

After April receives a warning from her imprisoned father, she and the Turtles embark on a mission to save him and stop the Kraang from detonating a mutagen bomb in the city.

The Turtles must defend their home in the sewers when Bradford tries to destroy it with a dangerous chemical.

When simultaneous threats from the Purple Dragons and Baxter Stockman's mechanical Mousers force the Turtles to split into two groups, Donnie & Mikey must prove that their "B Team" is just as valuable as Leo & Raph's "A Team."

Michelangelo befriends an unstable mutant alligator who possesses a strange piece of Kraang technology, but the other Turtles aren't sure whether Leatherhead is a friend or a foe.

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.

Leonardo, tired of Raphael's constant criticism, lets his brother try his hand at leadership for a while. Meanwhile, Leonardo meets a beautiful and dangerous female ninja who tries to lure Leonardo to the dark side.

The Turtles get their first taste of high school when April's school project draws Kraang attention.

The Turtles meet their first fanboy when a teenage wannabe hero decides to fight crime and dress up as "The Pulverizer."

While breaking into the hostile environment of TCRI headquarters, the Turtles discover the true intent of the Kraang and resolve to stop the alien invasion once and for all.

As the Turtles try to foil a Kraang invasion plot, they are hunted by a giant, indestructible cockroach.

Fed up with being humiliated by Fishface and Dogpound and defeated by the Turtles, Baxter Stockman seeks revenge by luring both parties into a deadly labyrinth.

After witnessing the Kraang in action, Karai realizes the seriousness of the alien threat and approaches the Turtles to propose an alliance.

While the Turtles are infiltrating an undersea Kraang base, the Foot Clan attempts to capture April, forcing her to fend for herself in a battle of wits against Karai.

When Shredder schemes to create a fearsome army of mutants, the Turtles have no choice but to rely on the help of the newest recruit to the Foot Clan: The Pulverizer!

After Leonardo, Raphael, and Donatello fall under the control of a parasitic Wasp, Michelangelo must fight his brothers to save them.

Donatello breaks into a secret Kraang detention center in order to rescue Kirby O'Neil. But when he discovers they are trapped inside with a deadly mutant prisoner, he realizes that breaking in was the easy part.

As the Turtles make a desperate assault on TCRI to shut down an alien portal, they find themselves engaging in the most difficult battle yet.

As the Turtles make a desperate assault on TCRI to shut down an alien portal, they find themselves engaging in the most difficult battle yet.