Thanks to a malfunction in Donatello's Inter-Dimensional Early Warning Detection Machine, a tear has occurred in the fabric of space and time, allowing two heinous criminals from Dimension X, Skaarg and Dementor, to arrive in the city.

Splinter is contacted telepathically by his sensei, Master Mogo-san who requests that Splinter meet him at Pier 17.

The turtles, Groundchuck and Dirtbag are taken to Shellri-La by an alien "Turtleoid" named Kerma. Kerma seeks help from the turtles to defend his planet from a two-headed dragon named Herman the Horrible.

The turtles unmask the dragon as they prove that the menacing creature is actually operated by two renegade Turtleoid delegates. Kerma return the turtles back to Earth, where they destroy Shredder's new Technodrome Mark II and afterwards defeat Chrome Dome.

Krang summons General Tragg from the Dimension X to keep the Turtles busy while Shredder places a remote control transmitter upon a rocket ship preparing to launch a satellite with a new super laser.

Under the Arctic Ocean Krang is tuning up his Robotic Body. While no one is looking, Bebop and Rocksteady inadvertently destroy an important computer chip and surreptitiously replace it with one from a video game.

While the Turtles are busy trying to decide what costumes to wear to this year's Channel Six Halloween party, April and Irma are doing a story on the reverse polarity magnet at Magno-Dyne Labs.

While Splinter is away on meditative satori, Donatello sets his sights on solving world hunger. He invents the food revivafiver, a device designed to reverse the aging process of food.

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 go to the Top Notch Scientific Corporation to stand guard over the sonic disintegrator.

Shreeka, an alien with an attitude and a vendetta against Krang, after having spent eons tracking him down, has finally found him.

Donatello tells the other three Turtles that, based on his calculations, the Earth has changed its orbit and is heading for the Sun.

Donatello's newest invention, the Dream-o-Vision helmet, causes Michaelangelo and Leonardo to be stuck in a nightmare world.

After another night's performance of the robotic Willie Wombat Revue at the Willie Wombat Revue Theatre, a mysterious figure, wearing a long black cape, black fedora, white face mask, and known only as the Phantom, makes an appearance.

Donatello goes to Channel Six News to give Vernon a piece of his mind after he had made disparaging comments about Turtles on live TV.

When Donatello, Michaelangelo, and Raphael return from the video arcade they discover that Donatello's lab is in disarray and Leonardo is missing.

While practicing their martial arts, Leonardo tells Splinter that he is convinced that there is one combat maneuver he has yet to teach the Turtles.

Michaelangelo returns from his sojourn to the pet shop with a monkey named Clyde. After only a few minutes with the undisciplined pet Leonardo, Donatello and Raphael demand that it be returned to the pet shop.

Burne assigns April a story reporting on the increase in urban crime. The only problem is that urban crime is decreasing.

While the Turtles are watching their favorite TV show April interrupts the broadcast with a special bulletin about a break-in at Dynamic Science Labs.

While rummaging through the local junkyard the Turtles witness the crash landing of an alien spacecraft.

At the Museum of Fine Art Shredder uses his time portal to journey back to ancient Japan so that he can destroy Splinter and the turtles.

Krang, Shredder, Bebop and Rocksteady break in to the City Hall Records Department and steal maps of the sewer system dated 1895.

While investigating the most recent robbery perpetrated by the Mole Squad, April and the Turtles stumble upon a secret meeting between the Mole Squad and Dr. Floyd O'Toole, a scientist who has been missing for weeks.

The Turtles visit April at Channel Six News and ask her if they could use the stations' equipment to contact their old Turtleoid buddy, Kerma, on Shell-Ri-La.