As impossible as the idea might sound, “Westworld” creators Jonathan Nolan and Lisa Joy actually entertained the idea of having a “Game of Thrones” crossover.

Fans of both HBO shows might have never considered this possibility, but the two revealed to Entertainment Weekly that “Game of Thrones” author George R.R. Martin actually brought up the idea to them before the show even aired.

Instead of featuring a Roman or Medieval World in future seasons, Martin suggested that they create a Westeros World filled with hosts that are characters of the well-loved series. With this idea, Khal Drogo, Rob and Ned Stark can be resurrected.

But what did Nolan and Joy say to his idea? “We love George…” said Nolan. “He’s a lovely guy and a stunning writer and it’s flattering he would encourage a crossover. We should be so lucky.”

But Joy said there is one very important reason why the crossover cannot happen. “I need to believe that dragons are real,” she explained. “I want them be a real thing. So as much as I love George, I can’t lose that for myself!”

In fact, Nolan and Joy seem to have no intention of creating other worlds in the next few seasons. One general assumption is that the setting will change in Season 2, since the original 1973 film by Michael Crichton also featured Roman and Medieval worlds.

When Nolan was asked about it during New York Comic Con, he put the rumors to rest. “You said Roman World and Medieval World, right? No,” he said, according to Slash Film.

Earlier, the two told Collider that the Western theme park is the “ultimate playground” for them because it enabled them to deal with questions about artificial and human intelligence, as well as human behavior.

“It was like a candy store. I’d seen the film when I was a kid and really dug it, but this way into it allowed us to really, really get under the hood,” said Nolan. “We also wanted to explore the guest experience and the techs’ lives and the conflicts with these creatures that they’re interacting with and controlling, but that central idea of seeing A.I. from the inside out was where it was an offer that we could not refuse.”

“Westworld” airs every Sunday at 9 p.m. ET on HBO. Westworld HBO's successful sci-fi drama “Westworld” has been renewed for a second season. Photo: HBO