Every year at Comic Con,Game of Thronesproducers used to reveal a slew of new characters that would be appearing in the upcoming season of the HBO series. This year, though, that tradition was put to an end, as the producers didn’t reveal any new characters or cast members that will show up inSeason 6. Since then, there have been several reports and photos from theGame of Thronesset that have revealed new characters, and today we have a new yet unconfirmed report fromWatchers On the Wall, which claims that a character who hasn’t been seen sinceSeason 3, is coming back. There may be potential SPOILERS below, so read on at your own risk.

The character in question is Brynden Tully, a.k.a. The Blackfish, played by British actor Clive Russell. Blackfish was last seen sneaking out of the infamous Red Wedding at the end ofSeason 3, and the character has long been thought to be alive, even though we haven’t seen him over the past few years. Brynden Tully is the uncle of Catelyn Stark (Michelle Fairley), one of the many who lost their lives during the infamous Red Wedding, along with her son Robb Stark (Richard Madden) and his new bride Talisa (Oona Chaplin).

This report claims that sources spotted Clive Russell filming scenes in Corbet, Northern Ireland, filming scenes that reportedly involve a massive siege at a Riverlands castle controlled by House Tully, with Brynden Tully defending this building from attackers. This report also claims thatNikolaj Coster-Waldau(Jamie Lannister) and Jerome Flynn (Bronn) were also spotted on the set. There was a report from September that claimed Jamie and Bronn would be travelling to the Riverlands, which has now apparently been confirmed.

While the show has largely caught up toGeorge R.R. Martin’sA Song of Fire and Icenovels, it seems these scenes will be based on parts of the author’s fourth book, A Feast For Crows, which covers the siege of Riverrun and Brynden Tully’s role in that battle. There is another character who has been missing since The Red Wedding, Catelyn’s younger brother Edmure (Tobias Menzies), who has been held hostage off screen. The actor has been busy lately with his hit Starz seriesOutlander, so it isn’t known if he will return.

While Clive Russell’s return has not been confirmed yet, otherSeason 6cast members includeIan McShanein an unspecified role,Pilou Asbæk, who has been rumored to be playing Euron Greyjoy, the uncle of Alfie Allen’s Theon Greyjoy andMax von Sydowas theThree-Eyed Raven.Richard E. GrantandEssie Davisare portraying members of a theater troupe who are putting on a play about famous figures inWesteros, withJames Faulkner, Samantha Spiro and Rebecca Benson signing on to play the father, mother and sister of Samwell Tarly (John Bradley). What do you think about these new casting details forGame of Thrones?