Don, Splinter and others in “Unfinished Business”

Are you kidding!? You do one awesome thing and you can't even remember how you did it!!?

Donatello, be glad that Michelangelo's tomfoolery yielded the gift that it did. You must find all the humans and turn them back.

We don't even know where they are.

I think I do. They were taken to Dimension X by the Kraang. I see them in my dreams. Millions of people, trapped there.