Gralik took great pride in his work, often insisting on checking and rechecking that the kemocite was pure enough for whoever had ordered it. He refused to let his work be corrupted, however, by selling kemocite to weapons manufacturers.
Gralik was fond of taking long walks in the wilderness outside the colony; he sometimes hunted tree scarabs.
In Archer's attempt to trick Degra into revealing the location of the weapon, it was claimed Gralik was executed for his sabotage. (ENT: "Stratagem")
Gralik Durr was played by John Cothran, Jr.. He was the only Xindi to have a given name and a surname.
In the final draft script of "The Shipment", Gralik Durr was described as "an older, somewhat gruff man". The same script later commented, "As we'll see, Gralik is a proud man... not one who's easily intimidated [....] Despite his age, Gralik is remarkably at home [outside, on the Arboreal colony], moving easily at a brisk clip."