Shredder 1987:"I'm in the middle of something here, Krang!"
Krang:"First, you get us stuck here in this infernal dimension, and now you struggle to defeat this primitive creatures? If my troops from Dimension X were here..."
Shredder 1987:"Oh, quit nagging about Dimension X. We're having enough trouble in this dimension. Can't you see there are eight turtles now?... Wait... That's it! Of course, if this dimension has it's own version of the turtles, perhaps it has it's own Shredder as well!"