Fringe Stars Tease 'Mind-Blowingly Good' Series Finale - Plus: Photos Of Walter's Lab 'Secrets'!

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Astrid, Walter, Olivia and Peter prepare for a mission in the Fringe series finale "An Enemy of Fate."

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Olivia surrenders.

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Peter battles Windmark.

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Peter and Olivia prepare for the final extraordinary battle for the fate of mankind.

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Peter watches Olivia as she prepares for a mission.

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Peter contemplates the plan to defeat the Observers.

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Windmark and the Commander decide the Child Observer's fate.

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Me, searching through the lab's ambered tunnel in search of, like, Olivia's cell phone number... or something.

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While I'm here, may as well give Asteroid some help with the lasering....

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Oops. Done got ambered. If you find me at the 2036 marketplace, pay a fair price. At least 50 walnuts.

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Sorting through Walter's impressive and vast stacks of wax, we find on one turntable Michael Jackson's Thriller....

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...and on the other, a little Peter, Paul and Mary. (Kids, a "turntable" is what we used to play "records" -- or "LPs" -- on back in the day.)

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Rifling through the lab's fridge, not a drop of Red Bull to be found.

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Massive spoiler alert! Walter's been a diabetic this whole time?! [See top shelf, far left.]

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Think William Bell approves of Walter's book selections...?

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Definitely not bigger on the inside.

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Hypothetically speaking, if I got it off the hinges, would this have fit in my carry-on luggage?

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Bidding the lab a very final adieu, with Warner Bros. TV publicist Kristi Strupinsky, GiveMeMyRemote.com's Marisa Roffman and IGN.com's Eric Goldman.