Voyager finds a solution to combat the invader of Borg space. Janeway asks for free passage through their territory and in return she'll share a biological weapon. Seven of Nine is assigned to work with Janeway and the Voyager crew, but can the Borg be trusted to uphold their end of the bargain.

Torres has a stressful & emotional day with Paris.  A race decimated by the Borg, called the Caatati request major assistance from Voyager.