After winning a free European vacation, the Turtles journey to Paris, France. Meanwhile, Shredder, Rocksteady & Bebop are planning to steal metal from the Eiffel Tower in order to power up the Technodrome.
Still in Paris, the Turtles & Master Splinter visit the Louvre. Meanwhile, due to Shredder's incompetence, Krang's new Hyper Rocket Thruster becomes a Rust Encruster, with which he plans to oxidise the world's famous landmarks & monuments, unless world leaders use their power reserves to bring the Technodrome back to Earth
The Turtles take a tour of Venice, Italy, just in time for the annual Mardi Gras festival, which April is covering for Channel 6. Meanwhile, Shredder & Krang plan to hold the priceless treasures of Venice to ransom by using Krang's HydroFluxor to flood the city.
The Turtles & Splinter arrive in Lisbon, Portugal, just in time for the annual Running of the Bulls. Meanwhile, Shredder & the mutants will use Krang's new heat ray magnifier to burn the city to ashes using the power of the Sun unless the Turtles can stop them.
The TMNT & Splinter journey to Dublin, capital of the Republic of Ireland, land of myth & legend. Meanwhile, Shredder, Rocksteady & Bebop use Krang's Rainbow TransCharmer to transform all of the cute, furry animals in Dublin into vicious beasts.
Shredder takes possession of the mythic sword, Excalibur, and proclaims himself "King Shredder." The Turtles, along with Merlin, must take it from him or else the Medieval Times will merge with the modern world.
The Turtles take a trip on the famous Orient Express that runs from Gare de Lyon in Paris, France to Istanbul, Turkey. But Shredder is also on board and is planning to use Krang's new Super Charger to launch the Orient Express into the world's largest oil
In Amsterdam, Netherlands, the Turtles must stop Shredder from stealing the Duchess Diamond, that Krang needs to power his Laser Dimension Blade. Shredder has some competition though, as two bumbling thieves also want the diamond for themselves.
The Turtles are in England, when they are taken back to the past, via an experimental atomic clock and must team up with Sherlock Holmes and Doctor Watson in order to get the clock back and return to the present.
After a fight with Shredder causes Donatello to be struck by a laser beam, his personality changes to become a costumed superhero known as the Dark Turtle. His mission: Seek out & destroy Shredder. Meanwhile, a dinosaur-like alien race called Triceratons, invades Earth.
A small alien being, named Quirx, crash-lands on Earth, with intergalactic stormtroopers in hot pursuit. The Turtles must figure out how to get Quirx back to his home planet, before Earth is destroyed.
Shredder uses a time machine to travel back to Ancient Japan in the year 1583. He plans to defeat Hamato Koji, the man who founded the Foot Clan, and Splinter's great ancestor, for if Hamato Koji is defeated, then Master Splinter would never have been born and the Turtles would forever remain ordinary turtles.
While Splinter's sensei, Mogo-san, is visiting New York, a criminal gang of ninja, known as the Black Heart Gang, are terrorising the city with a crime spree, and Mogo-san's grandson, Yoku, is their leader.
In an attempt to finally defeat the Turtles once and for all, Shredder assembles Leatherhead, Tempestra, Scumbug, Chrome Dome, Antrax, The Rat King and Slash to form a team that proves too much for the TMNT.
The Turtles discover an Atlantean city, not in ancient Greece, but in modern times. After meeting a merman who, in reality is the true King of Atlantis, the Turtles must defeat Shredder & dethrone Bebop, who been set up as a puppet king
Professional mutant hunter Dirk Savage is conned into to rounding up New York's mutants, Tokka, Rahzer, Two of the Punk Frogs, Leonardo, Michelangelo and Mondo Gecko all fall prey and become part of a mutant slug's army
A new amusement theme park has opened with Shogun, Medieval & Future themed attractions. The Turtles are invited to try out the attractions, but when the robots in the park start to play too rough, the Turtles are in big trouble.
After bringing the Technodrome back to the surface, Shredder and Krang trap the Turtles and send them to Dimension X where they become slaves. In the meantime, Shredder and Krang back on Earth once again try to take over the world.