Kelsey was the leader of a group of mercenaries that boarded the USS Enterprise (NCC-1701-D) during preparations for a baryon sweep in 2369 at Arkaria Base.
Their purpose was to steal the trilithium resin, an extremely unstable byproduct of warp travel that accumulated in the ship's engines. Her plan failed when Jean-Luc Picard who had briefly returned to the ship in order to avoid an invitation from Commander Calvin Hutchinson, who was in charge of the station performing the baryon sweep.
Kelsey was killed when the trilithium she was transporting exploded after Picard removed the inertial stabilizer that had kept its container from vibrating and triggering the material. (TNG: "Starship Mine")
- Kelsey was played by Marie Marshall