This is bordering on spoiler territory. Some people here may not even know that name because they're trying to avoid every single detail of season 5.
Keep in mind that details of episodes are spoilers until two days after the episode's release. Spoilers are to be placed in spoiler tags, which you can get by clicking the button that has the letters "Sp" in it, or by typing this
and typing the spoilers between the two tags, so it'll look like this