Zombie is a horror framework for vertical drama, built around the city after the turn. It is not a label you attach to a finished story — it is a set of expectations the audience arrives with, and the first ten seconds either meet them or lose them.
The short format suits dread better than any other, and suits a monster worse than any other. The power is in what is withheld. That matters more in vertical than anywhere else, because there is no establishing act to hide a weak opening behind. A viewer decides inside three seconds whether this is the thing they came for.
This page covers zombie as a production decision: what the format promises, where the conflict comes from, how to pace it across sixty short episodes, and what usually goes wrong. Everything below is written to be used while outlining, not after.