Great Job, Internet!: Why Bran’s time-travel on Game Of Thrones doesn’t collapse the universe
This season, Game Of Thrones introduced a time-travel element to the show. Bran, through his training with the Three-Eyed Raven, is now able to move around in time. What he can’t do, however, is change the past in such a way that it would change the future. Which raises the question: How does time travel work on Game Of Thrones? Thankfully the folks at Vox have put together a video explaining it.
Basically, there are three types of fictional time travel: the multiverse timeline, the dynamic timeline, and the fixed timeline. Most fictional time travel takes place in either a multiverse or dynamic timeline. (A multiverse timeline is one in which each choice you make in the past creates an alternate future, like in Doctor Who. A dynamic timeline is one in which your actions can affect the present you came from, like in Back To The Future.)