I mean, the first 'Back to the Future' is kind of a perfect script, I think, in terms of handling time travel the best. It depends on your definition. To me, that means it effectively uses it in the story.
“So, it's a very, you know - maybe we're wrong in - you know, we go around thinking the innovator is the person who's first to kind of conceive of something. And maybe the innovation process continues down the line to the second and the third and the fourth entrant into a field.”