A populated world whose moon is breaking up in a decaying orbit, prompting a joint demolition mission by the USS Cerritos and USS Vancouver in the Lower Decks episode Cupid's Errant Arrow.
Mixtus III features in the Lower Decks episode Cupid's Errant Arrow, set in 2380. Its moon is unstable, and fragments will soon rain down on the planet. The Cerritos is sent to assist the larger USS Vancouver in imploding the moon in a controlled way.
Captain Freeman's part of the job is talking, since delegates from across the system each object to the plan for their own reasons, down to a wealthy couple who are the only residents of one world. Meanwhile Tendi and Rutherford compete for one of the Vancouver's advanced diagnostic tools.
The mission reunites Boimler with his girlfriend, Lieutenant Barbara Brinson. Mariner is convinced that someone so impressive must be an alien impostor, and it emerges that there is a parasite at work, attached not to Barb but to Boimler.