The Blackfish (Clive Russell) is returning to "Game of Thrones" for Season 6, after leaving the series in Season 3.

Russell was spotted dressed to play The Blackfish, aka Brynden Tully, during filming this past week in Corbet, Northern Ireland.

The scenes may have been shot for the siege of Riverrun, and for a battle between The Blackfish and Jaime Lannister (Nikolaj Coster-Waldau).

In the Season 3 episode "The Rain of Castamere," The Blackfish was last seen during the Red Wedding, where his niece Catelyn Stark (Michelle Fairley) and her son Robb Stark (Richard Madden) were murdered. Since then, he has not appeared again.

Meanwhile, another character is returning to Season 6. User @gutygamez, a fan in Almeria, Spain, posted an Instagram photo of "GOT" actors, including George Georgiou who portrayed the Yunkai slaver Razdal in Season 3.

Razdal was last seen when Daenerys (Emilia Clarke) scared him out of town and took his gold. What will she do when he returns? Exactly how will the Yunkish people incorporate back into the story?

It's not clear what his purpose will be, but he is a rival to Daenerys. Will they battle with each other again? If so, will Razdal get killed? He was also photographed with actors from the Dorne storyline. Will he make a return there?

Showrunners are currently filming Season 6 of "Game of Thrones" at locations in Northern Ireland, Spain and Croatia. Cersei Lannister (Lena Headey) was recently spotted at the same location where her daughter Princess Myrcella Baratheon (Nell Tiger Free) was shipped in Season 5.

Rumors suggest Cersei will request a "trial by combat" between Gregor Clegane, The Mountain (Hafþór Júlíus Björnsson), and his brother Sandor, or The Hound (Rory McCann). Gregor will fight for Cersei while Sandor battles for the Faith.

"Game of Thrones" will premiere on HBO in April 2016. Stay tuned.