'Game of Thrones' Season 6
Could we see Theon's (Alfie Allen) eldest uncle in "Game of Thrones" Season 6? HBO

Sure, we have three more episodes of "Game of Thrones" Season 5, but that's not going to stop anyone from thinking about what's next for the hit HBO show. This season is quickly going through the novels "A Feast for Crows" and "A Dance With Dragons," which means there will be no new published material from George R.R. Martin's "A Song of Ice and Fire" to adapt for Season 6. With the latest casting news, it looks like "Game of Thrones" Season 6 will be using a few storylines from "Feast" and "Dragons" that will introduce Euron Greyjoy and a possible flashback involving Bran.

Warning: "Game of Thrones" Season 5 spoilers and "A Song of Ice and Fire" discussion ahead.

Watchers on the Wall had the scoop on the casting news for "Game of Thrones" Season 6. The most exciting bit of information regards a certain middle-aged pirate. "He’s 'an infamous pirate who has terrorized seas all around the world. Cunning, ruthless, with a touch of madness.' He’s a dangerous-looking man. A very good part this season," reads the description of the unnamed pirate. Of course, "ASOIAF" readers quickly noted that the character description fits Euron Greyjoy perfectly.

Euron is Theon's eldest uncle and is a notorious pirate. His ship, Silence, is crewed by tongueless men and he claims to have traveled to the ruins of Valyria. In the novels, Valyria is an incredibly dangerous place that people don't return from. Euron returns to the Iron Isles after Balon Greyjoy dies, which leads to a Kingsmoot where the next king is chosen.

Euron's appearance makes sense based on previous speculation for "Game of Thrones" Season 5. IMDb cast lists for episode 9 and the season finale include the return of Yara Greyjoy and Balon Greyjoy, which may or may not be accurate. If it's true, the series could set up Balon's death in the "Game of Thrones" Season 5 finale and a Greyjoy storyline for next season. There's no news of Victarion, Euron's younger brother, but that casting could come later. Euron is crowned king and gives Victarion a dragon horn -- which can be used to bind them. Victarion is sent to Meereen to give Daenerys the dragon horn and the offer of marriage to Euron.

Interestingly, the casting news also calls for an actor to play Samwell Tarly's father. Randyll Tarly is a famed warrior with a Valyrian greatsword -- Heartsbane -- that he uses in combat. Watchers on the Wall believe the descriptions for mother, sister and brother fit the characters of Sam's mother, one of his sisters and Dickon, Sam's younger brother.

The description of the priest is a bit trickier as some users on Reddit speculate that it could be Aeron 'Damphair' Greyjoy while Watchers on the Wall and others believe it is Septon Meribald. If the latter is true it could mean the return of a presumed deceased character that crossed paths with Brienne last season.

A trio of boys could part of a Bran flashback. Bran seems likely to appear in "Game of Thrones" Season 6 and he could use a weirwood to peer back in time and catch a glimpse of his father, Robert Baratheon and perhaps Howland Reed as children. The leading actress could be a part of Arya's storyline as she joins an acting troupe.