Board Thread:General Discussion/@comment-1255374-20160326211319/@comment-995426-20160429211002

But what I'm thinking is, you can only go back in time in your own timeline, and once you branch a new timeline, only time travelers coming back from that new timeline's future can make an appearance in that timeline. The Earth turtles who went off for an "adventure" with the other Honeycutt had no more motivation to save the Earth or Splinter, as both had been saved.

Unless some kind of parallel universe sliding comes into play somehow. (No, I'm not talking about Nickelodeon/Murakami-Wolf-Swenson crossover. That was just...beyond weird, and not easily explainable by a branching of timeline in the near past.)