User blog comment:Sokatsui/Time Travel Paradox/@comment-24.87.61.44-20130128062733

With how we see Neutron at the end of "Bloodlines" I suppose that Greg and Brendon are working with the "over-write" time. If we were to take time as something that is unchanging and static throughout its entirety, then we get something like Harry Potter, where everything that will happen has happened, regardless of time travellers (unless they meet themselves). And you get something close to fate, where everything happens on its course of time, no later no earlier.

However, if we say that time can be rewritten, we get what I think is being used in Young Justice, as well as what's being used in Doctor Who. If time can be changed and rewritten, then there's no such thing as a paradox because eventually time will catch up and erase everything that can only be from a different timeline (e.g. Bart).

What I'm trying to say is, it looks like in Young Justice there is no temporal paradox because at the end of Bloodlines, we see a flash of light and then Neutron is cured, but the apocalypse still happens. If we extrapolate this, we can say that Bart has not yet stopped the Reach's invasion.