After Donnie upgrades Metalhead's artificial intelligence, he must decide if he can trust a sentient Metalhead.

Leo stages a rescue for Karai against Splinter's wishes. While the mission is a success, Karai's knowledge of the truth makes her rush out to take her revenge on Shredder for killing her mother and lying to her for so long, leading to an unexpected turn of events.

After an accident, Donnie finds himself slowly losing his intelligence.

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When Leonardo secretly allies himself with Karai, he gets himself into deeper danger than he could have realized.

Donatello becomes concerned and decides to test April, only to discover that her psychic abilities are rapidly growing in power.

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

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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.

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

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.