Here's a look at Nina and Peter working together. They have a great deal to solve on season three.
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Walter finds himself in a tough situation on the installment "Do Shapeshifters Dream of Electric Sheep?" He tries to explain it here.
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Circumstances at Massive Dynamic lie at the heart of this gathering. The scene is courtesy of the episode "Do Shapeshifters Dream of Electric Sheep?"
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Fringe Season 3 Episode 4 Quotes

Newton: You're going to have a very difficult time without me, you know.
Bolivia: Well, there are plenty of machines here. I can befriend a vacuum cleaner.

Nina: He's a bit unorthodox.
Peter: He's also tripping his brains out right now. You know that right?
Nina: Huh?