What Hides Beneath

시즌 1, 에피소드 8: The 2nd Mass. prepares to take the fight to the invaders with an assault on one of their bases. But Weaver's increasingly strange behavior worries Tom that he might not be fit to command. Hal and Tom encounter a left-behind woman (guest star Blair Brown- Fringe) who employed a suspicious means of surviving the invasion, making it unclear whether they can trust her.