This was a good episode I really liked Slash and the business men's plan. However I really felt bad for Slash in this episode, the way every one kept using him and tricking him. I under stand the turtles desire to clear their names for all the destruction that Slash had been doing but i felt they could have reached out to him. But I kind of wonder if the the turtles wheren't more sympathatic toward him because he was another mutant turtle and they felt alienated by him.
I think at this point the turtles are used to be unique and the only one of the kind. And crappy as it is that they are the only ones of their kind and how much they might resent that, it still makes up who they are and is really their identity that they are the only mutant turtles running around, and it makes them unique and perhaps special in a way as well. Now here is Slash another turtle that is mutant, and it shakes up their identity of being unique and special. So on top of all the other crap in their lives, now they don't even have the thought that they are unique either.
I think Slash makes the ninja turtles feel a little threatened by this. I mean in appearance Slash looks more like a turtle than the TMNT and is more in touch with its primitive origins. Unlike the turtles who seems to be more human than turtle. This must really hit them where they live to be reminded that they are more closely related to human than turtles.