Splinter allows the Turtles to visit the surface for the first time, where they attempt to stop a group of thugs attempting from kidnapping April O'Neil and her parents.

The Turtles discover a mysterious canister of mutagen, and realise that the kidnapping mystery is much bigger than they ever imagined.

Raphael loses his temper, blowing a mission and getting the team caught on video. Raphael must learn to control his rage and retrieve the video before it falls into the wrong hands.

To prove that Turtles can be friends with humans, Michelangelo uses a social networking site to befriend a famous martial artist who is secretly Shredder's top lieutenant.

Donatello uses a high-tech military computer chip to create a self-upgrading mp3 player. Which is great, until Michaelangelo drops it, and Baxter finds it.

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.