1. The Mummer's Dragon
So this one is a long-time coming. We already kind of know who this might be in the books, but the show has been surprisingly silent about this part of Quaithe's prophecy. When Quaithe tells Dany to beware the Mummer's Dragon, what exactly might she mean? Well, a mummer is an actor of sorts, and Dragons tend to refer to Targaryens themselves. Knowing this, the fan theories claims that we will see a certain Young Griff who will claim the Iron Throne as Aegon V, Dany's nephew who was slain by the Mountain during Robert's Rebellion. Perhaps the rightful line of succession from the Mad King will be maintained as it was originally intended after all!