Dead Set: Season 1

Season overview

Task: Create a JSON object for "Dead Set" Season 1.
Keys: overview (160-220 words), primer (array of exactly 4 concise bullet points).
Constraints: Use ONLY provided synopsis and sources. No invented details. No markdown. No asterisks. No headings. No bullet points in the overview. No markdown in the JSON.
Output format: Valid JSON only.
Source [1]: "Britain is in the grip of an apocalyptic crisis. While the housemates in the Big Brother house remain oblivious, fast-moving hoards of the undead decimate the studio compound." / "Zombies are rampaging throughout Britain. Blissfully unaware of gory events outside, the Big Brother housemates"
Source [2]: Director: Yann Demange. Cast: Jaime Winstone, Andy Nyman, Riz Ahmed, Warren Brown, Liz May Brice, Beth Cordingly. Running time: 141 minutes. Production: Great Britain 2008.
Source [3]: Cast: Kevin Eldon, Beth Cordingly, Warren Brown, Riz Ahmed.
Source [4]: Irrelevant (about Bob Newhart).
Overview: Needs to be 160-220 words.
Current info: Britain is in an apocalyptic crisis. Zombies are rampaging throughout Britain. The Big Brother housemates are oblivious/blissfully unaware of the gory events outside. Fast-moving hoards of the undead are decimating the studio compound.
Problem: The provided text is extremely sparse. It is impossible to reach 160-220 words without inventing details or repeating the same sentence multiple times.
Wait, the instructions say: "Write original, neutral, encyclopedic prose... If a detail is not in the provided material, you omit it rather than guess."
If I omit everything not in the material, I cannot reach the word count. However, I must follow the word count constraint if possible, but the "omit rather than guess" is a higher priority for a "meticulous archivist".
Let's see if I can expand the existing facts into a professional prose style.
Facts: Britain is experiencing an apocalyptic crisis involving rampaging zombies. The studio compound is being decimated by fast-moving hoards of the undead. The housemates living in the Big Brother house are currently oblivious to these gory events occurring outside.
Word count check: ~40 words.
I cannot reach 160 words without violating the "never invent or guess" rule.
I will write the most complete overview possible using only the facts