The K'tralli were a Vulcanoid alien species who lived on their homeworld of N'trahn in the K'tralli system situated close to the Romulan Neutral Zone. They were actually descended from the same racial stock as the Vulcans and the Romulan species. However, they were considered a distant offshoot civilization that formed their own culture with no traits similar to their racial forebears beyond their physical appearance. Unlike the Vulcans, the K'tralli expressed their emotions yet lacked the aggressive qualities seen within the Romulans. In addition to sharing a physical appearance, a K'trall's readings were incapable of being distinguished to a Romulans according to sensor scans. Furthermore, their physical form resembled a mixture between that of a Vulcan and a Romulan. As such, K'tralli c