Star Trek: The Next Generation (1987): The Best of Both Worlds (1)

Stardate: 43989.1 An Starfleet expert on the Borg, Lt. Cmdr. Shelby, is assigned to the Enterprise to investigate the disappearance of a Federation colony. Picard is abducted by the Borg and assimilated into the Collective, which forces Riker to attempt a rescue mission.