The Turtles' plans to enjoy Halloween are put on hold when strange monsters threaten to transform New York City.

The Turtles believe they have defeated most of their old enemies, but they soon discover that a new evil is rising from the ashes.

Karai searches for the legendary Kuro Kabuto, claiming to be the rightful heiress of the Foot Clan, when she suddenly encounters an old rival.

Donnie's grudge with Don Vizioso threatens the Turtle's newest mission.

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When Mona Lisa suddenly arrives on Earth, Raphael must get her and Bishop to work together to defeat an alien threat and save the Earth

The Newtralizer returns to New York City, more powerful than ever before, and joins forces with a dangerous and unexpected ally. With the help of Raphael's Salamandrian girlfriend, Mona Lisa, the Turtles fight back to defend their city.

: The Turtles are transported to an alternate dimension, where they befriend the rabbit samurai and master swordsman: Miyamoto Usagi.

Usagi leads the Turtles through a haunted forest, where they end up encountering mischievous and highly dangerous spirits.

Usagi and the turtles must help Kintaro fulfill his destiny as they reach the end of their journey.

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An older and weathered Raphael battles road gangs in a post-apocalyptic mutant wasteland.

An older, weathered Raphael battles road gangs in a post-apocalyptic mutant wasteland.

Renet transports the Turtles to 13th century Transylvania to stop Savanti Romero.

Savanti is soon to recruit Frankenstein's Monster and unleash all of his monstrous recruits on the 21st Century.

When the Turtles and Renet return to a present-day New York City infested by an undead army of monsters, they realize they may have made the situation even worse.

When 80s Shredder and Krang appear in the 2012 dimension, they employ Bebop and Rocksteady and find their plans are succeeding better than ever. Meanwhile, the Turtles try to adjust to life without serious bad guys.

The Turtles must train their 80s counterparts into fighting like real ninja. The 80s Turtles begin to learn the difference between their world and the world of their modern counterparts.

The Turtles, their 1987 counterparts, April and the Mighty Mutanimals must work together to stop 80s' Shredder and Krang from destroying the world. Meanwhile, Bebop and Rocksteady are faced with a difficult and life-changing decision.