E1 - The Mutation Situation

Aired: October 12, 2013

The Turtles discover that the Kraang survived their previous showdown and have dropped mutagen canisters all over New York City.

E2 - Invasion of the Squirrelanoids

Aired: October 19, 2013

While tracking mutagen, the Turtles bring a mutated squirrel back to the lair. When it starts multiplying, the Turtles must hunt the squirrel mutants and prevent them from escaping into the city.

E3 - Follow the Leader

Aired: November 02, 2013

The Turtles face an army of robot foot soldiers; Karai captures Leonardo and forces him to do battle with ninjas that can adapt to his every move.

E4 - Mutagen Man Unleashed

Aired: November 09, 2013

Donatello experiments with mutagen in an attempt to find a cure for April's mutated father. But one of his expirements goes wrong and he is unleashed in the city.

E5 - Mikey Gets Shellacne

Aired: November 16, 2013

Michelangelo plays with some mutagen, contracting a dangerous infection that mutates out of control.

E6 - Target: April O'Neil

Aired: November 23, 2013

April tries to resume her normal life; April realizes that she may have put her friend in jeopardy when Karai starts hunting her again.

E7 - Slash and Destroy

Aired: November 30, 2013

The Turtles find themselves being hunted by a new threat -- another mutant turtle called Slash, who has a personal vendetta against the brothers.

E8 - The Good, The Bad, and Casey Jones

Aired: February 02, 2014

After encountering mutants and ninjas, Casey Jones decides to take on "pure evil" alone. When he meets Raphael, the two hot-headed fighters must put their dislike for each other aside and work together against a common foe.

E9 - The Kraang Conspiracy

Aired: February 09, 2014

April feels left out and insists on joining the Turtles on a mission to TCRI; A secret about April's past is revealed...

E10 - Fungus Humungous

Aired: February 16, 2014

A fungus mutant spreads through the sewers causing the Turtles to experience their worst fears. Leonardo must face his greatest fear.

E11 - Metalhead Rewired

Aired: February 23, 2014

After Donnie upgrades Metalhead's artificial intelligence, he must decide if he can trust a sentient Metalhead.

E12 - Of Rats and Men

Aired: March 02, 2014

When the Rat King returns, Splinter must overcome his fears in order to defeat his enemy.

E13 - The Manhattan Project (1)

Aired: March 14, 2014

Leonardo considers asking Splinter for help while facing Shredder's new assassin; Donnie must put aside his rivalry with Casey in order to uncover a Kraang plot.

E14 - The Manhattan Project (2)

Aired: March 14, 2014

Leonardo considers asking Splinter for help while facing Shredder's new assassin; Donnie must put aside his rivalry with Casey in order to uncover a Kraang plot.

E15 - Mazes & Mutants

Aired: April 27, 2014

When the turtles play a Fantasy LARP game to get their minds off things, they separate the difference between fantasy and reality.

E16 - The Lonely Mutation of Baxter Stockman

Aired: May 04, 2014

The Turtles create a retro-mutagen to help April's father; Baxter Stockman threatens to mutate April.

E17 - Newtralized!

Aired: May 11, 2014

Raphael is worried about Casey's ability to handle big mutant threats especially when they meet Slash again and discover he has a partner of his own, the Newtralizer.

E18 - Pizza Face

Aired: May 18, 2014

Mikey struggles to convince the others that a new mutant is trying to attack and capture people using living pizzas.

E19 - The Wrath of Tiger Claw

Aired: June 08, 2014

When Tiger Claw returns, he vows to hunt and destroy the turtles, as well as April and Casey. Meanwhile, Karai finds out the truth about her mother and real father, forcing her to make a life changing decision.

E20 - The Legend of the Kuro Kabuto

Aired: June 15, 2014

Leo tries to convince the team to rescue Karai; a master thief steals Shredder’s helmet.

E21 - Plan 10

Aired: June 22, 2014

Raphael accidentally damages a machine that forces him to swap minds with a Kraang. Now he must find a way to convince his brothers and Splinter that it's really him, before the Kraang controlling his body destroys his brothers or worse, reveals their location to the rest of the Kraang.

E22 - Vengeance is Mine

Aired: June 29, 2014

Leo stages a rescue for Karai against Splinter's wishes. While the mission is a success, Karai's knowledge of the truth makes her rush out to take her revenge on Shredder for killing her mother and lying to her for so long, leading to an unexpected turn of events.

E23 - A Chinatown Ghost Story

Aired: September 12, 2014

Donnie becomes increasingly jealous of April and Casey's relationship; April is kidnapped by an evil spirit who intends to drain her powers.

E24 - Into Dimension X!

Aired: September 19, 2014

When the Turtles go to the bizarre realm of Dimension X, Mikey is the only one who can figure the place out.

E25 - The Invasion (1)

Aired: September 26, 2014

Leo and Donnie disagree about their plan to stop the Kraang invasion; Donnie must step up as the leader of the bunch when Leo makes a mistake and is separated from the team.

E26 - The Invasion (2)

Aired: September 26, 2014

Leo and Donnie disagree about their plan to stop the Kraang invasion; Donnie must step up as the leader of the bunch when Leo makes a mistake and is separated from the team.