In the mirror universe, Lieutenant Elizabeth Ryckert was a Terran officer who served in the Imperial Starfleet of the Terran Empire during the 23rd century. Ryckert served as security chief under Commodore Robert April aboard the ISS Constellation. She led a team that stormed a Klingon science outpost on Donatu V. (TOS - Mirror Universe short story: "Ill Winds") It is unknown whether or not Ryckert has a counterpart in the primary universe.