Snowpiercer: Season 4

Season overview

Role: Meticulous television and film archivist.
Task: Produce a JSON object for "Snowpiercer" Season 4.
Constraints:
Use ONLY provided synopsis and sources.
No invented titles, names, dates, episode counts, awards, ratings, box-office, viewership, or plot points.
If a detail is not in the material, omit it.
Write original, neutral, encyclopedic prose in plain text.
No markdown, no asterisks, no headings, no bullet points in the prose.
Output valid JSON only.
Required JSON keys:
overview: factual 160-220 word summary of this season's narrative arc.
primer: array of exactly 4 concise bullet points summarizing essential previous lore, character positions, and stakes.
Source [1]: "More than seven years after the world has become a frozen wasteland, the remnants of humani" (cut off).
Source [2]: American post-apocalyptic dystopian thriller. Premiered May 17, 2020, on TNT. Based on 2013 film (Bong Joon-ho) and 1982 French graphic novel Le Transperceneige.
Source [3]: Created by Josh Friedman, Graeme Manson. Cast: Daveed Diggs, Mickey Sumner, Alison Wright, Iddo Goldberg. Seven years after the world became a frozen wasteland, remnants of humanity inhabit a perpetually-moving train that circles the globe. Mentions class warfare, social injustice, and politics of survival.
Source [4]: More than seven years after the world has become a frozen wasteland, the remnants of humanity inhabit a gigantic, perpetually-moving train that circles the globe as class warfare, social injustice and the politics of survival play out.
Source [5]: Set more than seven years after the world has become a frozen wasteland.
TMDB Season Synopsis: "Earth is covered in ice and is uninhabitable. The last surviving humans traverse the planet on a train, where they struggle to survive and maintain a balance that grows more fragile with each passing day."
Problem: The provided sources contain zero information about "Season 4" specifically. They provide general information about the series as a whole.
Constraint Check: "If a detail is not in the provided material, you omit it rather than guess." "Do not invent plot events or spoilers."
Constraint Check: "produce a JSON object with keys: overview: factual 160-220 word summary of this season's narrative arc