Showdown in Dimension X Arc

The Showdown in Dimension X Arc is one of the many story arcs of the series.
== Synopsis ==
The protagonists got caught in a war between themselves and an alien race called The Kraang who's goal is to invade Earth and to teraform the Earth into Dimension X.
The Kraang have been using Mutagen, the same substance that created the turtles, to create a mutant army to kill the protagonists.
The Utroms joined in on the fight against their lifelong enemies.