Krang's computers detect an alien metal on the surface of the Earth. Krang sends Shredder, along with an Alien Metal Detector, to the surface to find it.

Still searching for a way to destroy the Turtles, Krang develops a super pump that he intends to use to flood the sewers.

Full of self doubt, Leonardo leaves the team. Michaelangelo, Raphael, and Donatello all take turns being leader as they try to figure out why the sun is getting smaller.

A bump on the head leaves Leonardo thinking that he is in 17th century France, and that he and his comrades are Musketeers.

Shredder programs the city's new garbage collecting super-computer to collect the Turtles. But when Shredder doesn't specify 'Ninja' Turtles, the super-computer collects them all! Turtles of the city of every shape and size are not safe.

The Shredder thinks he's Michaelangelo after a computer malfunction.

Aliens abduct Donatello and Rocksteady.

A visit to Earth from a Polarisoid results in havoc when Shredder comes into possession of the alien's camera, because it does more than just take pictures.

Krang sets his sights on a powerful Nuclear-Powered Submarine, believing it's fuel will be more than enough to power the technodrome.

Baxter Stockman returns for revenge against the Turtles and Shredder, while our heroes attempt to stop Shredder's plan to siphon water from an underground reservoir.

An eager vigilante is causing a stir in the city, while Krang and Shredder take control of all the machines in the city. Maybe this new 'hero' can help the Turtles.

In an attempt to hijack two separate trains carrying the ingredients needed to make mutagen, Rocksteady and Bebop cause their head-on collision, resulting in the spillage of both chemicals in the city's train yard.