A Trill scientist who comes to Deep Space 9 in 2372 as part of Lenara Kahn's team attempting to create the first artificial wormhole from the Defiant.
Doctor Hanor Pren is a Trill who appears in the fourth-season Deep Space Nine episode Rejoined. He is one of the three researchers from the Trill Science Ministry, with Lenara Kahn and her brother Bejal Otner, who use the station and the Defiant for their experiments.
Pren is courteous and absorbed in the work, and he is on hand as Jadzia Dax and Lenara, whose previous hosts were married, are drawn back together. Trill society forbids such reassociation on pain of exile, and Lenara's colleagues watch the two with growing unease.
He takes part in the tests from the Defiant, the last of which ends in a collapse that badly damages the ship, the accident in which Dax risks her life to bring Lenara out of engineering.