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Fringe, season 1 episode 8 «The Equation»: air date November 18, 2008. Episode overview, season trailer and the cast of Fringe.
When a child music prodigy is abducted by a serial kidnapper, it's discovered that a sequence of flashing lights appeared at the abduction, which Walter links back to his bunkmate at St. Claire's Hospital. Much to Peter's dismay, Olivia encourages a return visitation for Walter, and Walter's determination to help ends up having chilling ramifications.