Those of who you who haven't read the Game of Thrones books most likely aren't familiar with the name "Lady Stoneheart." Still, there's a chance you may have seen it in some of the more spoiler-y comments floating around given that many book fans were expecting to see her last night on Game of Thrones' Season 4 finale. Why? Well, because she appears for the first time at the very end of the third book, A Storm of Swords. Which is the book that finally closed out, after two seasons, with last night's episode. Could she appear later on in the series? Certainly. But many readers were probably looking for that extra "gotcha" ending last night. Perhaps even so they could film their friends' expressions and post them on YouTube.

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Bottom line, Lady Stoneheart is... (lastwarning before we fully discuss it below!)...Catelyn Stark brought back to life by Thoros' "Lord of Light" R'hllor resurrection power. She's pretty much an avenging zombie.The director of last night's Game of Thrones Season 4 finale, Alex Graves, has been doing a lot of episodic follow-up interviews this year. And in a recent chat about "The Children," he spoke about the omission of Lady Stoneheart. Graves stated that EP/creators D.B. Weiss and David Benioff, who wrote the episode, never intended for her to be a part of the season at all."She was never going to be a part of it," Graves told Vulture . "I know it caught on on the internet, and people really started to believe it. I think the bottom line is that there was so much going on, at least from where I stood, that it wasn’t something to get into because, you know, when you get into taking Michelle Fairley, one of the greatest actresses around, and making her a zombie who doesn’t speak and goes around killing people, what’s the best way to integrate that into the show?""I don’t think there was room for it this season," Graves continued. "I don’t know what they’re going to do about it, because it is certainly something people attached to. I was attached to it because I established Thoros of Myr and Beric Dondarrion last year in the story to rejuvenate her. I have no idea what they plan to do about that because honestly, it just wasn’t talked about. It wasn’t on the radar. It didn’t come up in season four. I asked it last year in season three, when I was doing the Beric scenes. They said, 'Oh, yeah, you know, that’s a whole thing that we’re just not sure what we’re going to do about.' That was the conversation."Graves, having not read the books himself, offered up his own take on perhaps why she was kept out of Season 4. "From what I know of the books, it’s like, Okay, what’s she really there for? Because I think she goes around - and it’s vague to me because I haven’t had to direct it, so I haven’t looked at this in detail - but essentially she’s a reaction to the Red Wedding. Part of the reason I think people got so wound up with her coming back, I think, was because of the emotional toll of the Red Wedding, which I totally get. Like, Bring her back and have her kill some people! Joffrey’s death was meant to play to that need a little bit. And also Tywin’s."

Matt Fowler is a writer for IGN. Follow him on Twitter at @TheMattFowler and Facebook at Facebook.com/Showrenity