When a perfectly healthy woman is found dead from a disease she never had, the Fringe team investigates the origin of this inexplicably fatal condition before it claims more innocent victims. Meanwhile, Olivia struggles to keep Walter's secret from Peter, and her loyalty to Peter is tested as time goes on.
Elenco: Anna Torv , Jasika Nicole , Joshua Jackson , John Noble , Mark Valley , Blair Brown , Georgina Haig , Kirk Acevedo , Lance Reddick , Michael Cerveris , Seth Gabel .