Star Trek: Voyager - Dark - Frontier

During the mission, the Borg Queen (played by Susanna Thompson) contacts Seven of Nine, offering her a choice: rejoin the Collective or watch Voyager be assimilated.

Captain Janeway organizes "Operation Fort Knox," a tactical raid on a Borg vessel. The crew trains extensively on the holodeck to perfect the retrieval of a transwarp coil. Star Trek: Voyager - Dark Frontier

The episode balances a high-stakes "current-day" mission with critical flashbacks to Seven of Nine's childhood as Annika Hansen. During the mission, the Borg Queen (played by