Board Thread:Questions and Answers/@comment-27630911-20160118002750/@comment-995426-20160407220619

I would expect it would create a new parallel timeline where the Ulixes turtles changed history. At that point, there would be two groups of characters existing at the same time. And since I doubt the show would go on having duplicates of so many of the cast at once every episode for the remainder of the series, it would seem likely that one of the two groups would leave the show.

Maybe the Ulixes turtles can make a heroic sacrifice saving their counterparts who never left Earth, and they can be written off similarly to Same As It Never Was.