Zetar (or more specifically, Zetar II) was a planet located somewhere in the Alpha or Beta Quadrants, within the local space of the galaxy known to the Federation. This was the second planet in orbit of the Zetar star system in Quadrant 3. (ST reference: Maps) The episode itself does not reference the time of the world's death, but the figure placing it hundreds of years prior to the 2260s is sourced from the Who's Who reference comic.