[Insert rating, e.g., 4.5/5]

The city cradled secrets in its belly; none were purer or more volatile than PGI-257. It had been harvested from a casualty of the Inundation—a disaster several years back that drowned the eastern wards and birthed a generation of scavengers. PGI-257 was the echo of someone who had walked through that flood and returned different, stitched with code that felt like a pulse.

Similar codes are sometimes used for niche media identifiers or product labels in specialized databases.

What did this episode do better than others in its niche? (e.g., "Highly accessible explanations" or "Unique visual style").