WestworldTwo epic dramas set in unusual worlds, both on HBO — it's natural that fans have been clamoring for a crossover between "Westworld" and "Game of Thrones." And it's something the creators of "Westworld" thought about even before the show premiered — and all thanks to George R.R. Martin, the writer behind "Game of Thrones."

OK, so the crossover idea is based on the 1973 "Westworld" movie which featured other android-populated places like Roman World and Medieval World. That last one could be turned into a "Game of Thrones"-themed park. And apparently, Martin jokingly suggested the idea to Jonathan Nolan and Lisa Joy.

"We love George and our daughter's first trip anywhere in the world was out to Santa Fe for a screening of 'The Prestige' at his theater, the Jean Cocteau," Nolan told Entertainment Weekly. "He's a lovely guy and a stunning writer and it's flattering he would encourage a crossover. We should be so lucky."

The biggest hitch is that it would mean dragons are actually androids. As Joy explained, "I need to believe that dragons are real. I want them be a real thing. So as much as I love George, I can't lose that for myself!"

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