Can you imagine if the Turtles took on a mature theme? Like PG 13 territory? Like if they busted up a child trafficking ring? Not necessarily for prostitution, but for child soldiering, experiments for genetic mutation, or organs for said reason. However, to find out where to go to save these kids, they might cross sources that were related to that kind of operation else where. I don't think the major bad guys would be in on it, but because they're running a criminal empire, and because there is a war time conflict on another world, those are two aspects that usually make human trafficking thrive. Like I said the major badguys might not be part of it, but would be very cold about it, like Shredder being the warlord that he is just seeing it as "a by product of war." I also want to see the turtles kill someone. Doesn't have to be bloody. It can be just like that TMNT CG movie where Leo killed that crime lord leader with a machete in South America. Just to know he had the balls to kill a person when he really needed too.