|Class:||Defiant class warship|
After the Terran Rebellion on Terok Nor in the mirror universe built their own Defiant, Zek and Bashir turned the abandoned Empok Nor station into a shipyard capable of producing up to twelve Defiant-class starships at one time. The Capital Gain was the first ship produced there, and was captained by Zek.
Like the rest of the Defiant-class warships, the Capital Gain was equipped with a Romulan cloaking device. After Empok Nor and the other Defiant-class ships were destroyed by the IKS Ya'Vang, the Capital Gain was captured and its cloaking device fell into the hands of the Alliance.