A fungus mutant spreads through the sewers causing the Turtles to experience their worst fears. Leonardo must face his greatest fear.

When the guys discover a Kraang ship buried under April's house, they also uncover April's lost mother.

The Turtles must brave the bizarre world of Dimension X to save the enslaved people of New York. Part 1

Part 2

After being kidnapped by the hypnotized Karai, the Turtles are placed in deadly traps that they must work together in in order to escape. Splinter, in his efforts to save the turtles, is forced to face Karai in order to free her from Shredder's control.

The Turtles journey through an ocean-like area of space.

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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.