Along the way they meet a younger version of Guinan (who already owns her bar at 10 Forward Avenue) and an ancient ancestor of Data's creator – another of Brent Spiner's many Star Trek roles.
This Star Trek: Lower Decks article contains spoilers. When it comes to Star Trek aliens, inconsistency is consistent. Klingons, Trills, and Ferengi have all undergone revisions, some very radical.