Olivia and Lincoln take drastic measures to deal with the looming threat from the translucent shapeshifters, while helping Peter find his way home. Something “over there” occurs that hasn’t happened since the universes were linked at the end of last season.
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So now it's not Peter but Olivia who has to die? Well, it seems like even the great observers' minds change a lot -.-
I can't remember exactly how many "What the f**k?" I've said through the episode.