Hey, Fringe fanatics, ready to have your mind blown again?

After the last two tragic, game-changing episodes, it looks like Walter, Peter and Olivia are ready to take the battle to The Observers like never before.  On this Friday's episode, "Through the Looking Glass and What Walter Found There," a new tape is discovered, sending Walter out on his own to search for answers.  A few weeks back, I visited the set of Fringe in Vancouver and talked to stars Anna Torv, Joshua Jackson and John Noble about this particular episode, which they were in the middle of shooting.

"Essentially, we're fighting Observers today," Torv said with a grin, also telling me that a ton of the episode takes place inside one particular building. "We've been in this, like, green hallway for days, and we've been doing it in parts too." 

Jackson -- who, at the time, had to keep quiet about the big change Peter went through in last week's episode -- was able to elaborate a little more on the whole "green hallway" aspect of the shoot.  "We are in the midst of the device that gets introduced in episode 1, about the tapes," he said.  "So that becomes the motivational device - plot device - of every episode mostly this season. That is the direct consequence of one of the pieces of Walter’s plan that he’s hidden. And it takes us into this hallway. He’s hidden a key component that, actually, I think will probably be for all the serious Fringe-heads the coolest reveal of the episode - What it is that’s in there."

Look, if Jackson's even geeking out about this fun reveal, then you know it's going to rock.  "This is one of those things you don’t want to tease too much, because maybe everyone will be like, 'meh,' Jackson shrugged. "The thing that we reveal in the episode that we’re shooting right now - if you geeked out on the mythology of the show - is going to be one of those 'knock-your-socks-off' moments."

Check out these two new clips from Friday's episode...

"We’ve mined our own history well for things going forward," Jackson continued.  "And it’s a smart show that takes things that either weren’t intended or were intended and is sort of engaged by its own mythology, and lets the story spin out of things that we’ve already established. So something that seemed incidental is going to come back to be crucial. And ultimately, it gets one of our characters to his or her natural finishing state in a way that is going to make the original intention -- or that thing that seemed incidental -- seem so f**king cool."

John Noble, whose Walter Bishop has now buried himself in his quest to take down The Observers, talked to me about his path on this particular episode. "In the episode now, I'm sort of going through a few manifestations of just retrieving Walter's lost memories, depending on what memories are coming up at the time," Noble said.  "So, it's an interesting challenge.  His brain is jangled.  Having regained a lot of his skills, now he's had them all shattered again, which creates a problem. Then we have little pieces of it returning at different times, and different manifestations of his character coming back."

"The reason [Walter] had his brain cut out was because he didn't actually like what he was," Noble added, "which was a man of hubris and arrogance. That sort of slips back in every now and again.  Some of the stuff is almost Walternate-like.  Very stern and hard."

"Through the Looking Glass and What Walter Found There" airs Friday, November 9th at 9/8c on FOX.

Matt Fowler is a writer for IGN. Follow him on Twitter at @TheMattFowler and on IGN at mattfowler. No other choice you will ever make will be as easy and render such a great reward.

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