April O'Neil, ace reporter for Channel 6, investigates recent break-ins, allegedly by Ninjas, which have resulted in the thefts of numerous technologies. A chance encounter with a gang of thieves soon leads her to a bigger story when she is saved from the criminals by four Ninja trained, mutated Turtles.

As Shredder lures Splinter into he Technodrome, this time with the promise that a weapon in his possession can restore the sensei to human form, the Turtles confront a giant-sized Krang, now in a new body, in the heart of New York City.

The Shredder kidnaps Splinter in an attempt to lure the Turtles to his own cause. In order to rescue Splinter the Turtles must enter the Shredder's mobile fortress and brave it's dangerous weaponry.

Krang sends Shredder to set up a special lens that will focus the sun's rays to create a devastating heat ray.

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

Krang, sick of Shredder's constant failings, resolves to return the Technodrome to Earth.

While the other Turtles go off to the local Planetarium to see O'Malley's comet, Michaelangelo visits the Natural History Museum with April O'Neil for the unveiling of the mummy of Ahmed Turt-el.

The Turtles and Splinter win a trip to Europe, but wind up riding in a crate with the Turtle Van. Meanwhile, Krang devises a giant electromagnet to pull the Technodrome free from an asteroid.

Lord Dregg launches a final attack on the Ninja Turtles.

The personalities of Shredder and Splinter are switched when a device is accidentally activated during a battle between the Turtles and their enemies. As Shredder plans the Turtles' demise and Splinter plans on how to get back to his body, everyone else is clueless.

Krang has come up with yet another brilliant plan to free the Technodrome. The evil alien sends Bebop and Rocksteady to kidnap Buffy Shellhammer, 15 year-old CEO of Shellhammer Chemicals.

Shredder & Krang are still loose on Earth, but without the resources of the Technodrome, they plan to steal equipment from the abandoned Hall of Science at the World Fair. Krang's former weapons engineer, Drakus, using the guise of Beserko, also shows up to cause trouble.

Burne has created a hot line for callers to use should they spot those responsible for the destruction of the Channel Six News Building. Inside the Hall of Science, Shredder is fearful that the Turtles will eventually find a way into the building and decides to seek out an old friend in the sewers: the Rat King!

Baxter Stockman, a mad scientist, is showing an exterminator his new invention: a rat catching robot called Mousers.

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.

Leatherhead has come to the city searching for the Turtles. While crawling through the sewers he encounters the Rat King who charges him with trespassing.

After several setbacks, Shredder and Krang steal all of New York's electricity and charge it into a giant transdimensional gateway, designed to send Earth into Dimension X. The Turtles must defeat their enemies once and for all before Earth is destroyed by Krang's Rock Soldier army.

In Krang's latest scheme, Rocksteady and Bebop, dressed as Easter bunnies, are blasting people with a Docilizer Ray and turning them into timid, rabbit-like people.

Thanks to a malfunction in Donatello's Healthometer, an invention designed to diagnose one's health, Raphael is convinced that he is not long for this world. Raphael decides to make the world a better place with what little time he has left.

Krang wants to get a hold of the Polarisoids' camera. Krang sends a fake invitation to the Polarisoids to visit Earth, only the Polarisoids think that the invitation is from the Turtles.

Krang plans to blow up the Tri-State Bridge just as a convoy of trucks carrying a rare form of toxic waste passes overhead.

The Turtles are vacationing in the Alps, as Splinter goes off to a nearby mountain to meditate. April is in an Alpine village with Irma when she notices the ice and snow melting, unusual for this time of year.

Eric Red, seizes both April and Professor Swenson's map to the underground volcanoes in Scandinavia to tap into the molten energy and melt the polar ice caps.

While investigating the theft of a rare telescope, the Astro-Viewer, the Turtles discover odd tracks leading away from the National Space Exploration Center.

The Turtles are still on the search for the last fragment. Shredder finds the last fragment and connects all three to his helmet.