Is (theoretical) timetravel possible without automatically creating a paradox?

[RagnaToad]

I dont see how travelling to something that is not yet existent is more plausible than travelling to something that used to be existent?

And the alternative worlds theory is a common theory, but I think it's rather hypothetical. You can't go to another world. You couldn't change the past and then go to the world in which everything is different. The "other worlds" which is spoken of are hypothetical, theoretical, call it what you want.
I don't think there is an actual physical reality other than ours, but there are many possible worlds.
As I said, the concept of "time" is in our heads, as are these other worlds.


kind of off-topic but also kind of not:

I love it when novels/films are not set in the future, but instead, set in an alternative world. E.g. 'V for Vendetta', a world in which the Nazis won the war and the whole(/European?) world has gone fascist.