This female Orion crewwoman was a member of the Avenger's crew in early 2155. She assisted Soval in taking over the Avenger, manning the tactical station, and was killed when the Defiant destroyed the ship. (ENT: "In a Mirror, Darkly, Part II")
The Orion officer was played by background actress Andrea Lockhart, who received no credit for her appearance.
The Star Trek Customizable Card Game gives her name as D'Vela.
