They previously revealed they were big fans of the HBO show, and recorded the track White Walker for Game Of Thrones compilation Catch The Throne: The Mixtape Vol. 2.

The band met some of the cast and one of the writers at last year's Sonisphere - and that led to the opportunity to appear in the latest episode which was filmed in Belfast last November.

Kelliher tells Alexander Milas: "It just so happened that we were starting a tour and they were shooting a scene in Belfast the day before. So the stars aligned and we were able to fly in a day early, quickly get there and jump into a scene.

"There was a lot of playing dead which contrary to popular belief is not that easy to do. I actually fell asleep, laying down on the ground with my battle axe by the water because I was so jet-lagged."

Kelliher says they didn't get to take any props home but adds: "I did get to sit on the throne and take some photos. That was really amazing. We saw Castle Black from afar."