A Klingon warship under Commander Morag that patrols the border near Relay Station 47 in 2369 and comes under suspicion when the station's crew disappear.
The IKS Qu'Vat is involved in the Next Generation episode Aquiel. Relay Station 47 lies close to the Klingon border, and its logs show that the Qu'Vat's commander, Morag, has made a habit of approaching and taunting the two Starfleet officers posted there.
When one officer is found dead and Lieutenant Aquiel Uhnari is missing, Picard asks Governor Torak to produce Morag. Torak resents the request but complies, and Uhnari, who fled the station in a shuttlecraft, turns out to be alive and in Klingon hands.
Morag admits to visiting the station and copying Starfleet messages, but denies murder. He becomes one of the suspects until Doctor Crusher works out that a coalescent organism, able to consume and imitate living beings, is the real killer.