Season 5 Episode 6:
Through the Looking Glass and What Walter Found There
A team member assumes a new role; Walter follows a lead.
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FBI Special Agent Olivia Dunham, brilliant but formerly institutionalized scientist Walter Bishop and his scheming, reluctant son Peter uncover a deadly mystery involving a series of unbelievable events and realize they may be a part of a larger, more disturbing pattern that blurs the line between science fiction and technology.