Zalkonian

The Zalkonians were a reclusive race native to either the planet of Zalkon. In the 24th century, many individuals of the race were transforming into non-corporeal beings. The government dealt with these individuals harshly. Zalkonian warships were relatively advanced, and posed a risk to a Galaxy class Federation vessel. The warships also possessed some sort weapon which was able to suffocate crews of enemy vessels. First Contact with the United Federation of Planets occured in 2366.

Territory
The Zalkonians seemed to occupy a region of space of unknown size. The Federation had apparently not been aware of the Zalkonians or their space as of 2366.