But there's a logical paradox at the heart of such speculation. If you did indeed travel back and kill Hitler thus averting World War 2, then there would be no future in which World War 2 had happened and therefore no need for you to travel back from any such future to kill Hitler.
My novel "Time After Time" tries to deal with theses paradoxes of time travel in a humorous way. And the inspiration behind it? The "Terminator" movie, in which Arnie Schwarzenegger's Cyborg travels back to the past to prevent the future leader of the resistance against the machines from being born...
For me the Daddy of them all, although the time travel aspect isn't always the first thing that comes to people's mind when they talk about it. I love this movie, logical flaws and all. Brilliantly plotted, slyly about our own times rather than anything futuristic, although it's clear that were we to stay on our current course, we would end up in the dystopia shown at the start of the film. Arnie is of course perfect as the emotionless machine.
The first of the real historical figures travelling out of time movies in this list, instead of someone in the present travelling back to meet real historical people, this projects that sci-fi author HG Wells actually built his time machine, but Jack the Ripper uses it to escape the forces of law and order and lands up in the future - our present - which he finds most conducive to his murderous predilections. Wells travels forward in time to bring him back to justice. a good little film which I saw on its release as a teen and just remember how gory it was. I bet if I saw it now it would seem really tame, a mixture of my being older and our own thresholds having been pushed into accepting more.
One of those films about returning to the same moment each time and trying to alter its outcome, of which there are several
"La Jetée" on which "12 Monkeys" is based and it just blew me away. it has more profound things to say about time travel and meeting yourself in the past and future than most films. And it's a silent film largely told in stills. Amazing.