Since the Emmy Award-winning television series "Game of Thrones'' is set to return next year, rumors have been circulating online about the casts and the plot of the sixth season.

It was reported that Kit Harrington was spotted on set even when his character was killed by the Night's Watch at the end of the fifth season. As of the moment, no official word yet if the character has indeed been killed.

According to Vine Report, Harrington was seen in a leaked picture wearing a different armor. It's no longer the black one that he wore when he was in the Watch. It was also noticed that he is carrying Long Claw, the Valyrian sword given to him by Lord Commander Mormont before he died. This could mean that Jon Snow is planning an attack to reclaim Winterfell from the Boltons as Vanity Fair suggests.

The rumor on Winterfell siege is justified when another image leaked online. The picture shows a bunch of men holding banners with different siglis such as the bear of House Mormont and the direwolf of House Stark.

Meanwhile, actors Art Parkinson and Natalia Tena have been spotted in Belfast. Characters Rickon Stark and Osha whom they portray might return for the sixth season of "Game of Thrones.''

HBO's "Game of Thrones" Season 6 will air in early 2016.

Screen Crush said Season 6 of "Game of Thrones" stirred so much interest among which characters might return. Natalie Tena (Osha) and Art Parkinson (Rickon Star) are seen to join Season 6.

In another portion of "Game of Thrones" Season 6, screen legend Max von Sydow has been cast as the mysterious Three-Eyed Raven to a returning Bran, while Deadwood alum Ian McShane will also portray a mysterious role.

Debate about the next season continues to rage as to whether Kit Harington's Jon Snow will participate in Season 6, even as Harrington was seen in Belfast, and stories seem to confirm scenes set at The Wall next year.