hen a woman bursts into flames and explodes, Olivia and Peter start to look into it, and Olivia starts seeing things -- which Walter explains as possibly her seeing an alternate reality. The investigation leads back to the experiment Olivia was part of as a child, and points to a high member of the FBI as well as links to Massive Dynamic. Meanwhile Nina comes to Broyles with her concern that The Observer has been sighted again, and frequently.

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