A reclusive species whose agreement with the Federation was the final diplomatic achievement of Ambassador Sarek after nearly a century of effort.
The Legarans are a species never seen on screen, known for elaborate demands in diplomatic dealings, including a special environment that their conference partners had to provide.
Sarek spent ninety-three years preparing a treaty with the Legarans, a conference held aboard the Enterprise in Sarek, his final mission. Bendii syndrome was eroding his emotional control at the time, and he mind-melded with Jean-Luc Picard to borrow the composure he needed to complete the negotiations.