The Epsilon Nel system (or Nel system) was an inhabited planetary system. The system had two inhabited planets, including Nel III. This system was one of eight visited by a group of Ullian telepathic historians in the 2360s, who collected a library of memories from the inhabitants. Soon after the visit, one of the planets in the system, Nel III, reported two unexplained comas. The comas were later determined to be a result of telepathic memory invasion perpetuated by Jev. A person of interest in the case, Tarmin, was exonerated as he was on his species' homeworld at the time of the visit. (TNG: "Violations" )