Fringe: Season 1, Episode 18

1 - 18: Midnight

The investigation into the deaths of people whose bodies are drained of their spinal fluid leads the Fringe Division to a scientist named Nicholas Boone (Jefferson Mays) with ties to the bioterrorist cell ZFT. Boone's wife Valerie (Trieste Dunn) is the killer, having been infected with an extinct syphilis strain that drives her to consume her victims' spinal fluid. Her first victim onscreen is a suave clubgoer, Bob Dunn (Richard Short). In exchange for information on ZFT, Walter aids Boone in creating an antidote to cure Valerie. Boone has to use some of his already low amount of spinal fluid to formulate the antidote, costing him his life. Olivia and Peter successfully capture Valerie and cure her. A video made by Boone prior his death reveals that William Bell has been funding ZFT.