Talk:Earth's Last Stand/@comment-27116643-20160425002615/@comment-995426-20160425045752

WhalBP:

Well, at first that's what I was going to assume. That one rule of time exists under the Scepter (where it's impossible to alter the past), and another rule of time exists under the Ulixes (where they intentionally altered the past). But I'm not actually confident the writers will maintain any one neat set of time travel tropes. As it is, in time travel fiction, it makes very little sense to write a story that involves racing against the clock when you have a time machine to help you erase mistakes&mdash;when a story tries to do this anyway, tropers sometimes call it San Dimas Time (named after the absurd race-against-the-clock time travel plot in Bill & Ted's Excellent Adventures). But to force this plot device to work in the past half season of TMNT, they made up that poorly-conceived plot detail about not being able to travel back in time twice because the black hole sucks time...which raises issues of how, if true, time travel was supposed to be able to work at all, or why they couldn't travel somewhere else in the universe, then travel back in time, then travel back to Earth space. When a plot hole is patched with yet another plot hole, tropers sometimes call it a Voodoo Shark (named after a plot device invoked in the novelization of the film Jaws).