Is it just me who gets totally confused with all the time travel stuff? LOL... if the future never happened then how could Harry watch the video at the end of himself in the future... argh I have a headache! 

My theory is that temporal paradoxes can be explained by invoking the notion of parallel universes. The Kim whose mistake killed everyone on Voyager lives in a universe that always will exist, despite the fact that he corrected the mistake.
Parallels in TNG goes by the theory accepted in Trek of alternate timelines - which works, but it would raise the question for Future Harry... if he didn't stop existing, would he know it was a sucsess?
Well, seeing as how the Delta Flyer in that timeline blew up with him on board, he'll never know whether or not his timeline continues.![]()
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