Time journey in films is at all times a doubtlessly troublesome factor to take care of. As a theoretical idea, it offers with a bunch of scientific points that may be troublesome to reconcile, which signifies that when fiction makes use of the idea, it is handled in a variety of other ways. Making a time journey story match collectively in a approach that feels each sensible and satisfying is among the harder issues for such tales to do. Unless you are writing a comedy about a few slackers attempting to cross a historical past take a look at. Maybe then, do not overthink that one.