For the most part, Game Of Thrones has done a remarkable job maintaining the consistency of its fictional universe, avoiding things like cameos from real-life celebrities, the sort of things that can rip you right out of the story. There are exceptions, though. During the moments before the show’s bigger events, it’ll sometimes work in quick appearances from musicians. Coldplay drummer Will Champion helped play “The Rains Of Castamere” just before the show’s Red Wedding scene, and the members of Sigur Rós played court musicians during Joffrey’s Royal Wedding. Last night’s episode was a big one, too, and it featured Mastodon members Brann Dailor, Bill Kelliher, and Brent Hinds playing wildling warriors north of the Wall. Given that Mastodon already look like wildlings, this is probably the most appropriate cameo yet. Also, they’re fans of the show, and they contributed the song “White Walker” to the show’s Catch The Throne Vol. 2 mixtape earlier this year. Dan Weiss, who co-created the show along with 25th Hour screenwriter David Benioff, is a fan of the band, and he invited them to be in last night’s episode. And here’s a statement, with a few light spoilers, from Dailor:

It was such an incredible experience to be on set as extras for our collective favorite show Game Of Thrones and to be wildlings murdered and then brought back to life by White Walkers was beyond amazing. I watched my best friends Brent and Bill, murdered right in front of me as I myself was stabbed in the stomach and had my throat slit multiple times, and I didn’t mind at all. It made me love being in Mastodon even more. We are more than privileged and honored to have been a part of one of the greatest stories ever told on film, and the catering wasn’t bad either.

Could Mastodon write a whole concept album in character as wildlings? What’s stopping them?