The Turtles go along with Michaelangelo and his pet pigeon to the zoo so that Dr. Goodfellow can check the bird out.

Krang's attempt to split the Inter-Dimensional portal goes awry. By utilizing the pirate radio station WOOF Krang believes that he can use the station to lure the City's populace into Krang's Chasm.

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.

A robot warrior arrives from 400 years in the future in 20th-Century New York.

Emperor Aleister of Malicuria comes to New York City, bringing along a shard of Lydium 90 to the USA.

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.

A 14-year-old boy tries his best to help out the Turtles, but with some not so optimal results.

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

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

Donatello decides to create a clone of himself so that he can spend more time on his inventions while his clone spends more time fixing things around the Lair. Donny tests his latest invention on a sewer rat and accidentally gets his hand in the way, causing the rat clone to talk just like Donatello.

Splinter suffers amnesia as the Turtles try to remind him that he is the true leader of the Foot Clan.

Shredder tricks Usagi Yojimbo into battling the Turtles.

Shredder experiments with the Inter-Dimensional Portal, hoping to contact Krangs' Rock Soldiers and prepare an invasion of Earth, but a group of fun-loving aliens called the Neutrionos, renegades in Krang's dimension, take advantage of the Portal's opening and use it to arrive on Earth.

Thompson assigns April to research the growing rat infestation. She is pursued by an army of rats and escapes on a passing city bus.

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.

A rabbit ronin warrior from an alternate dimension is lost in our world. While the Turtles help him adjust, Shredder steals a dragon egg to unleash it on the city.

Zach and his brother Walt visit the Turtles. As they leave, Walt takes a map that could guide Shredder to the lair if it happens to fall into the wrong hands.

Kala's pet Grybyx, which has a really bad temper whenever it gets hungry, escapes from Dimension X through a portal to Earth, causing trouble for the Turtles.

The Technodrome is up and running again, and it is up to the Turtles to hinder Shredder and Krang from getting to the surface.

With the Technodrome in serious need for new equipment, Bebop and Rocksteady are sent to Earth, disguised in human form, to capture the Channel 6 building and return it to Dimension X.

A professor's new ray-gun causes plants to go wild and his pet ape Jocko to become a giant rampaging monkey. By using the same ray-gun, Donatello is increased to Jocko's size so he can fight the giant ape and save April from him.

While trying to see the new toys at the Toy Fair, Michaelangelo stumbles upon a plot to take over a noted toy company.

The Turtles must battle a reanimated Terracotta Army after Shredder steals an energy device shaped like a giant pearl, which is held and guarded by a Jade Dragon.