Three episodes into "Game of Thrones" Season 7, fans are getting more and more excited about the upcoming war against the White Walkers. Now, one question has been a subject of speculation since last year - yes, on who will be the Targaryen dragon riders.

As early as October last year, Zimbio has reported on some theories about the issue. Of course, as long as the episode has not been shown, nothing is final, right?

Who will ride the Targaryen dragons aside from Dany and Jon Snow?

Drogon, Viserion, and Rhaegal - the only three dragons in the world have been raised and cared for by Daenerys Stormborn since "Game of Thrones" began.

According to Zimbio, there is no doubt that the Mother of Dragons will ride Drogon. We have seen it before, and it looks like we could expect it as well when the fight against the Night's King finally takes place.

This brings us to Rhaegal, which could have Jon Snow as a rider. Jon Snow's parentage has been a major issue in the series, and it is surmised that he is a Targaryen.

Also, the current season sees him coming to Dany for help - this could be a prelude to all these assumptions. Jon Snow has also proven that he can train and tame mythical beasts, with Ghost as a perfect example.

According to Vanity Fair, Viserion's rider is thought to be Tyrion Lannister. Tyrion's real parents are also still a mystery, and the unexpected bond that he and Dany have developed is something that could back this theory up.

Zimbio added that the red and gold of House Lannister and the red and gold scales of Viserion could also be an indication that the dragon and Tyrion are meant to be partners.

My random guess if not Tyrion would be Grey Worm. Why not? He's one of Dany's bravest warriors. And hey, his scene with Missandei in episode 3 kind of placed him in the limelight.

HBO hacked: 'GoT' files compromised?

Meanwhile, HBO recently experienced a cyber hacking, which unfortunately compromised a couple of the network's series. Allegedly, at least one of HBO's shows had its script leaked online. Could it be "Game of Thrones"?

Per Entertainment Weekly, the network is not releasing any comments to confirm any contents of what might have been stolen by the hackers.

Richard Plepler, HBO's CEO and chairman disseminated an email on July 31 to all employees to alert them of the security breach.

The hackers have claimed to have gotten 1.5 terabytes of data from the company and have published an alleged upcoming episode of "Ballers" and "Room 104." A spoiler for "GoT" is reportedly going to be leaked next.

Watch "Game of Thrones" Season 7, Sundays at 9:45 pm EST, only on HBO.