When a scientist is killed by a blue dust that disintegrates his bones, the Fringe Division investigates the case and suspects a biological attack. The investigation leads them to a former marine, who flees but is hit by a car and is in a coma. Walter recalls his Cortexiphan patient Simon Phillips, who is capable of reading minds. Olivia, Peter, and Walter try to convince Simon, who lives in a deserted area, to help them to locate the terrorists, but he is sensitive to other people since he cannot control his ability. Simon agrees to help and also discloses Peter's real feelings for Olivia to her.
