Ligon II

Ligon II is Class M planet located in the Ligon system, and is home to a humanoid species known as the Ligonians.

In 2364, the USS Enterprise-D was dispatched to Ligon II to discuss with Lutan, the leader of Ligon II, the release of a rare vaccine for a deadly disease that had broke out in Styris IV. During Lutan's visit to the Enterprise he kidnapped Lieutenant Natasha Yar is a show of strength.

The situation was resolved, and the vaccine released, when Yar and Yareena, Lutan's wife, engaged in a fight to death over Lutan's affections. Yar defeated Yareena, and Yareena was revived aboard the Enterprise. (TNG episode: "Code of Honor").

In an alternate version of the mirror universe, the ISS Enterprise-D was also dispatched to Ligon II to obtain the vaccine. But in this reality, Captain Jean-Luc Picard subjected the southern continent of the planet to lethal levels of gamma radiation and forced them to give up the vaccine. (TNG novel: Dark Mirror).