Technically speaking, the first Orion to appear in Star Trek was Marta in Whom Gods Destroy. Vina, as "Orion slave girl" was a Talosian illusion in The Cage, and doubly so in The Menagerie, Part II.

Lower Decks explores Orion culture, social structures, and customs for the first time. Blue Orions, originally from TAS, reappear in Lower Decks as adversaries of Green Orions. Blue Orions are ...

Who are the Orions in "Star Trek"? Hailing from the Alpha Quadrant ... Orion on screen until Animated Series episode "The ...