The homeworld of the Legarans, a people with whom Ambassador Sarek spent ninety-three years building the relationship that led to a treaty conference in 2366.
Legara IV is the home planet of the Legarans, a species with very particular environmental and ceremonial needs. It is the Enterprise-D's destination in the third-season Next Generation episode Sarek.
Sarek first made contact with the Legarans decades earlier and patiently nurtured the relationship for ninety-three years. In 2366 the work is to be crowned with a conference held aboard the Enterprise in orbit of the planet, for which the crew prepare a special chamber containing a pool of heated slime to the visitors' exact specification.
The talks are endangered when Sarek proves to have Bendii Syndrome, which is stripping away his emotional control and stirring violence among the crew. Picard agrees to a mind meld that lends Sarek his own discipline, allowing the ambassador to complete his final mission.