Morka is one of three Klingons who visit Deep Space 9 posing as ordinary warriors on leave while secretly spying on a Romulan delegation that has come to study Dominion intelligence.
Morka appears in the third-season episode Visionary. He arrives on the station with his companions Bo'rak and Atul at the same time as a Romulan delegation sent to collect Starfleet's findings on the Dominion. The three behave like rowdy soldiers on shore leave, drinking heavily in Quark's.
Chief O'Brien, who is being thrown a few hours into the future by radiation poisoning, witnesses a brawl in the bar involving the Klingons and the Romulans before it happens. His later time shifts lead him to a surveillance device concealed in the wall of the Romulans' quarters.
Odo's investigation establishes that the Klingons are operatives of Klingon Intelligence who planted the device, and they are taken into custody. Their spying turns out to be the lesser of the two plots O'Brien uncovers.