It goes like this: in a world where Daenerys Targaryen is just a bit more eager to return to Westeros, she is harsher in her conquest for liberation and her domains in Essos are kept better in line. In a world where Varys and Illyrio see opportunity earlier, they send Young Griff, otherwise known as Aegon Targaryen, to meet the Dragon Queen sooner. And in this world, they collide.