Commander Shelby was a Starfleet Officer in the 24th Century. She was an expert in Starfleet Tactical, especially in the matters of the Borg. She helped the U.S.S. Enterprise-D defeat the Borg at Wolf 359. After a Federation colony was destroyed by the Borg, Shelby stayed aboard the Enterprise to assist the crew in their dealings with the Borg. When Captain Picard was captured by the Borg and assimilated as Locutus of Borg, Shelby assisted the crew in retrieving him. She was also promoted as the Enterprise's executive officer at that time. After the dealings with the Borg, Shelby returned to Starfleet Command and was assigned to rebuild the fleet. Shelby was also a keen poker player.