"What Lies Below"  (Season 2 | Episode 12)  44:0
This week's episode on Fringe is titled "What Lies Below." During it, there's a lethal virus... and it's spreading. Walter, Broyles and Astrid search for answers when Peter and Olivia become trapped in a Boston office that's been quarantined by the Centers for Disease Control because of this deadly virus.
Original Air Date: 1/21/2010