'Game of Thrones' season 7 spoilers: Can Quaithe cure Jorah Mormont's greyscale?

A recent sighting of the actor Iain Glen on a plane to Belfast, a favorite "Game of Thrones" filming location, has got fans making conjectures on his possible return to the fantasy drama series in its highly anticipated season 7.

Glen, who plays Jorah Mormont in the series, has been spotted sharing the same flight with "GoT" co-star Gwendoline Christie, who portrays Brienne of Tarth.

The fan who saw the "Game of Thrones" stars shared on Twitter, "Both Brienne and Jorah Mormont are on my flight to Belfast. As I watched it last night I'm struggling to stay cool here."

Mormont was last seen on the show mid-sixth season. He had been sent away by Daenerys Targaryen (Emilia Clarke) to seek a cure for his ailment, the greyscale. It has not been clear since whether the character would return; after all, he is not the first to be sent on a journey and not come back.

The sighting could indicate that the actor may be appearing in "Game of Thrones" season 7. While the scripts have not been circulated, according to the cast panel at the San Diego Comic-Con last week, it is possible that the trip was for a possible fitting for some costumes or stunt matters.

If Mormont is indeed returning, a Reddit user postulated that there will be one person the knight will be seeing. Tasked with finding a cure for his greyscale, Mormont is said to head to Quarth to visit the one person who would know what to do.

The character last got acquainted with Quaithe (Laura Pradelska) in the sophomore run of the show. It is her that the lordly warrior will seek once more. The Redditor theorized that the mysterious Quaithe could not have been introduced on the show for the main reason of locating Daenerys' dragons.

The Reddit user pointed out, "There is only ONE person in the entire series who has mentioned/hinted/showed they know about ANYTHING regarding the treatment/prevention of Greyscale."

He also went on to add that Quaithe had been treating someone with the same condition at the time of her last meeting with Mormont. If there was someone who could help him, it would be this woman from Quarth.

"Game of Thrones" season 7 will premiere in 2017.