Yet another actor has been confirmed as a new addition to Game of Thrones for Season 4. This time it’s Joseph Gatt, who has an impressive résumé of roles in science fiction and fantasy films such as Thor and Star Trek: Into Darkness.  

Gatt’s agency, Robert Kelly Associates, now lists him on their website as having a role in GoT. Also, according to Gatt’s Twitter, he has filmed two episodes of an unnamed show in Iceland, and he will be filming two more sometime in the future. While he doesn't explicitly say he's working on Game of Thrones, it seems like a pretty safe bet that's why he's in Iceland.

Having a presence in four episodes out of a 10 episode season seems to indicate that Gatt will have a pretty sizeable role, so who could he be portraying?

Warning: The rest of this article contains spoilers from the A Song of Ice and Fire book series. Click away now if you don't want to know!

Our best guess is that Gatt will fill the role of Styr, Magnar of Thenn. In the A Song of Ice and Fire book series, Styr is a wildling war chief who leads the first assault on the Night’s Watch at Castle Black. Gatt’s appearance matches the book’s description of Styr almost perfectly; he is tall, imposing, and completely hairless (the only real difference is that Styr has no ears in the books, but we’re sure the show can work around that). Also, we know for sure that Styr will have a role in Season 4, since that fact was already confirmed by A Song of Ice and Fire author George R. R. Martin months ago.

Plus, if Gatt is a Wildling, that would explain why he has two more episodes to film in the future: The cast normally goes to Iceland during the winter months for location scenes beyond the Wall.

Given Gatt’s spot-on resemblance and our knowledge that Styr will be featured in Season 4, we’re willing to bet that we’ve solved yet another mystery of GoT’s sometimes secretive Season 4 casting. Bring on the wildling assault!

Do you think Joseph Gatt will play Styr, or do you think he'll fill another role? Sound off in the comments below!

Source: Robert Kelly Associates, @MeetJoeGatt