Just when the Turtles believe themselves rid of Shredder, tin-grin is able to persuade Krang to return him to Earth.

While practicing their martial arts in Central Park, the Turtles witness an alien spaceship crash into a small pond. The pilot warns them that they must find the three fragments of the Eye of Zarnof.

While the Turtles and April O'Neil scour the city for the Second Fragment of the Eye of Zarnov, Shredder sheepishly reports to Krang that he has lost the First Fragment.

After the batteries died in the alien crystal converger, Donatello, using spare circuits from the space ship, builds a tracking device to help locate the second fragment of the Eye of Zarnov.

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

Krang finally relents and provides Shredder with help in defeating the Turtles.

Frustrated at Baxter's latest failure, Shredder contacts Krang in Dimension X and demands that Rocksteady and Bebop be sent to aid him.

Shredder plans to acquire more mutagen and create more mutants. An ion storm in Dimension X interferes with the dimensional portal.

Sensing Master Splinter's despair at his new life as a rat, the Turtles agree to use the small amount of mutagen that they have left to concoct a formula that will revert Splinter back into Yoshi.

Shredder learns that the police have created a robotic cop and plans to steal then clone it. April gets a tip about the new experimental cop Rex-1 and breaks into the lab with her news camera for an exclusive story.

While experimenting with a matter transporter in his secret hideout, Shredder sends Rocksteady and Bebop to a nearby garbage dump. Through a series of mishaps, Rocksteady and Bebop find themselves in the Turtles' Lair.

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