In the mirror universe, Ensign Kelby was a Terran male in the service of the Imperial Starfleet of the Terran Empire during the mid 22nd century. In 2155, he was an engineering officer serving aboard the ISS Enterprise. Kelby was amongst the Enterprise crewmembers who survived the ship's destruction in escape pods when Enterprise became trapped in a Tholian web. (ENT episode: "In a Mirror, Darkly, Part I")