In 2371, two Cardassian scientists, Gilora Rejal and Ulani Belor were chosen by the Cardassian Union to assist in an effort to place a wormhole relay station in the Gamma Quadrant to aid communications and to provide an advance warning of a Dominion attack. The Obsidian Order, angry at the recently signed Bajoran-Cardassian Treaty, sent Dejar to Deep Space 9 to sabotage the attempt, posing as a third scientist. She sabotaged the USS Defiant‘s main emitter coupling.
Courtesy of Memory Alpha.org
When the ship fired at a comet that was about to destroy the Bajoran wormhole, it shattered the comet instead of vaporizing it as planned. Gilora did not wish Miles O’Brien to be blamed for incompetence resulting in the malfunction and she revealed Dejar’s status as an Obsidian Order operative. Dejar was taken to quarters and confined. Gilora was not worried over exposing her, telling O’Brien that the Order would not look kindly on her failure. (DS9: “Destiny“)
Dejar was played by Jessica Hendra.
After Kozak died in Quark’s in early 2371, Quark took credit for killing her husband, even though Kozak actually fell onto his own knife. She forced Quark to marry her so she could retain control of her house. Despite Grilka’s aversion to matters of finance, she allowed Quark to inspect her family ledgers where he discovered that D’Ghor, Kozak’s “brother”, had been systematically attacking the House of Kozak for five years in order to weaken it.
Courtesy of Memory Alpha.org
Such an indirect and deceptive attack was highly dishonorable and Grilka demanded Quark confront the High Council with the evidence of D’Ghor’s deceit. Once the accusations were made public Quark was forced to defend himself against D’Ghor and did so successfully by tricking D’Ghor into attempting to strike him down when he refused to fight. In doing so, Gowron was convinced of the accused Klingon’s guilt and had him discommendated on the spot. With D’Ghor out of the way, Grilka was granted control of her house by Gowron and the House of Kozak became the House of Grilka. She divorced Quark (at his request) on the spot. (DS9: “The House of Quark“)
In early 2373, Grilka visited Deep Space 9 again, along with Tumek and Thopok. The recent war with the Federation had been very costly to her house in ships, lands, and warriors. Though she feigned opposition to his request, she allowed Quark another opportunity to help her house by examining their records. This time, however, Quark’s interest was truly stirred by the “glorious” Grilka.
At the same time, Worf, who had been assigned to the station the year before, also took an interest in Grilka. He attempted to pursue her as a mate but Tumek confronted him and advised him it was a waste of time. Worf’s siding against the Empire during the war had stripped his House of its title and Worf of his honor; it would be unthinkable for Grilka to mate with him.
Upset by his failure, and Tumek’s insinuation that he could not know anything about pursuing a Klingon woman because he had been raised among Humans, Worf decided to help Quark win Grilka’s heart. He was successful by tutoring the Ferengi in the traditions of Klingon courtship. Grilka was warmed by Quark’s efforts, even if she considered him a poor fighter. But Thopok was enraged by the prospect of a Ferengi pursuing a great lady and challenged Quark to a duel. With additional help from Worf, Quark defeated Thopok and Grilka welcomed his advances enthusiastically. (DS9: “Looking for par’Mach in All the Wrong Places“)
Grilka was played by Mary Kay Adams.