The home planet of the green-skinned Orions and seat of the Orion Syndicate's ruling families, shown at length when D'Vana Tendi returned for her sister's wedding.
Orion is the homeworld of the Orion people, long spoken of in Star Trek as a centre of piracy and slave trading but seldom seen. Lower Decks puts it on screen in the fourth-season episode Something Borrowed, Something Green, when Tendi goes home with Mariner and T'Lyn for the wedding of her sister D'Erika.
The visit reveals what Tendi had kept quiet: her family is one of the great houses of the Syndicate, and she was raised as its heir and trained assassin, the Mistress of the Winter Constellations. She has to track down D'Erika, who has apparently been kidnapped, through the city's nightspots.
Tendi comes back in Old Friends, New Planets to ask for a warship to rescue Mariner, pledging in return to resume her place in the family. The fifth season opens with her serving House Tendi before she is released to rejoin Starfleet.