[Powder]

If it works for Thor Ragnarok (that's close enough, right?) then it could work for TMNT. But that's assuming the public can accept things that aren't directly from Fred Wolf (granted they pretty much had a Battle Nexus episode in the red sky seasons before such a thing even existed). It'd have to be your 3rd or 4th film to gel, I think. But I wouldn't want it to exist just to throw Playmates references at the audience, just stick with previously established inter-dimensional monsters or whatever.

Personally I'd rather see the Triceraton arena (well, their entire initial arc) stuff. But I'm game for any big brawl.