"Dark Frontier" - After defeating a Borg vessel, Janeway launches an ambitious plan to steal a piece of Borg technology that could get the U.S.S. Voyager home. When the Borg detect her plan, they swiftly access Seven of Nine's neural transceiver and make her an "offer" she can't refuse -- rejoin the Borg collective or the U.S.S. Voyager and it's crew will be assimilated. Janeway must confront the Borg in their own vessel in order to rescue Seven, risking a possibly devastating confrontation with the Borg Queen!
Starring Kate Mulgrew as Captain Janeway, Robert Beltran as Chakotay, Roxann Dawson as B'Elanna Torres, Robert Duncan McNeill as Tom Paris, Ethan Phillips as Neelix, Robert Picardo as The Doctor, Tim Russ as Tuvok, Jeri Ryan as Seven of Nine, Garrett Wang as Harry Kim.
Guest Starring Kirk Bailey as Magnus Hansen, Laura Stepp as Erin Hansen, Scarlett Pomers as Naomi Wildman, Katelin Petersen as Annika Hansen, Eric Cadora as the alien.
Special Guest Star Susanna Thompson as the Borg Queen.
This episode was directed by Cliff Bole. The story was by Terry Windell. The teleplay was by Brannon Braga & Joe Menosky.
TV Guide online synopsis for part two: Janeway steals the Borg warp core but loses Seven of Nine to the Collective, where the Queen (Susanna Thompson) puts her to work assimilating other species.