Dimension X is the representation of Dimension X in The Blue Door script from 2012, for a cancelled 2013 Ninja Turtles film. It is described as being both a parallel dimension and another planet in the script.
In the script, a Dimension X planet is about to collide with Earth. The Ninja Turtles, Splinter, Krang and Schrader all originate from Dimension X. The Turtle Warrior also comes from there and presumably Bebop and Rocksteady as well.
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