Has anybody ever read "Split Second" by Douglas Richards? It had an interesting way of dealing with paradoxes. There was a machine that could send items back in time a fraction of a second. When the object arrived, a small distance away due to Earth moving, a signal was sent aborting the sending. You now have two of the item. Paradox? Sure, but the universe didn't care. It just went merrily on.


But that'd be quite the twist if the movies had an overarching storyline.