After Jon Snow's return, the newest episode of "Game of Thrones" titled "Book of the Stranger", might also see additional characters returning from different seasons.

Latest pictures regarding Sunday's episode gives the viewers much to speculate about, as Littlefinger (Petyr Baclish) is seen returning for the first time is season six, according to News Week. Additionally, Margaery Tyrerll, who was last seen in season five as a prisoner, will also be making an appearance in the upcoming episode.

"For me, this time out, there's a level of atonement in relation to Sansa and my misjudgment of Ramsay Bolton. A lot of what I'm up to is atonement and really trying to align myself the right people-though, I guess, I'm always doing that," Aiden Gillian told Entertainment Weekly, while teasing the fans about Littlefinger's role.

"I left Sansa married to a psychopath. It's probably the one time we've seen Littlefinger slip up. He really didn't know about him. He should have."

Previously, viewers have seen that King Tommen is desperate enough to free his queen, which has caused tension between the Faith Militant and the royal family. Moreover, Tyrion is all set to make a deal with an anonymous party, and the reason for the same has not been revealed, reported Spoilers Guide.

Meanwhile Daario and Jorah have also made their progress in their "difficult task", but the task has not been revealed, while Jamie and Cersei try to improve their situation.

On the other hand, on the Iron Islands, Theon has found a way home, but is unable to explain to his sister about the horrors he had experienced in Reck.

All in all, the fourth season of "Game of Thrones" is set to answer a few questions but raise some more. "Game of Thrones" season six, episode 4 airs on Sunday 9 p.m. on HBO.