Could a billion people worldwide tune in for the premiere of "Game of Thrones"? Experts say it's possible. 

As the final season roars back this Sunday, one thing is almost certain: The episode will make ratings history. "Some reports even say possibly the billions, yes you heard that right," CNN's Chloe Melas said. 

To cut down on spoilers, the episode will air simultaneously in 170 countries around the world.

"There's gonna be a lot of drama, a lot of violence, a lot of sex and just a lot of action," added Melas. 

So who will sit on the Iron Throne? We'll just have to wait. 

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