How to Write a Series Bible for an Audio Drama

A series bible for an audio drama is the reference document that keeps a serialized show consistent across every episode: who each character is, how they are allowed to sound, what is true in the world, and which voice is locked to which role. Write it before you record episode two, not after you contradict yourself in episode six. The bible is the canon; the season plan is the schedule that sits beside it.

A series bible versus a season plan: the reference, not the calendar

These two documents get confused because you write them at the same time, but they answer different questions. The season plan answers "what happens, in what order, over how many episodes" - the episode arc, the season arc, the running times. That is scheduling, and it is covered in the season-planning post, so this post cedes it entirely.

The bible answers "what is true, no matter which episode you are in." It does not change when the schedule slips. A character's accent, a rule about what the magic can and cannot do, the fact that two characters have never met on the page - those belong in the bible because a listener will catch a break in continuity faster than you expect. In audio they have nothing but your sound to anchor them, so an inconsistency reads as a mistake rather than a reveal.

The spine of the bible: characters as canon

Every character gets an entry, and the entry is bigger than a casting note. The season-planning post already covers the casting table - "who is cast as what" - so treat the locked voice here as a single line that points back to that table rather than re-teaching the casting mechanics. What the bible adds is everything that governs how a performance should read later.

A useful character entry holds: the role and one-sentence function in the story; relationships to other characters (who they trust, who they lie to); a speech register (formal, clipped, rambling, regional) because that is what actually shapes delivery; the two or three facts they cannot contradict; and the locked voice assignment. The register line is the one most writers skip and most need. "Speaks in short declaratives, never swears, softens only around her brother" is a direction you can honor in episode nine without re-reading episode one.

A filled-in entry looks like this: "Mara Okafor - lead detective, drives the central case. Distrusts her partner, protects her brother at any cost. Speech: clipped, procedural, drops articles when under pressure. Canon: ex-military, left after an incident she never names; cannot swim. Voice: locked." Five lines, and every future scene has a direction baked in. Do this for leads and recurring characters; a one-line entry is enough for a walk-on who appears once.

World rules and continuity: what can and cannot happen on mic

World rules are the part the character sheet does not hold, and they are unowned by any scheduling doc. Write down the constraints that a listener would notice if you broke them. In a mystery: who knew what, and when. In a fantasy or science-fiction drama: what the technology or magic can do, and its cost. In a grounded drama: geography and timeline, so a character cannot be in two cities in one afternoon.

For audio specifically, add a continuity section for sound. If a location has a signature ambience - rain on a tin roof, a specific room tone - note it so the same place sounds like the same place three episodes later. The season post covers recurring motifs as the season's audio signature; the bible's job is narrower: record the fixed facts so your sound choices stay consistent, not just stylish.

The tone and sound guide: how the show is allowed to feel

A tone guide is a short, opinionated page that keeps a long series from drifting. Three or four lines do the work: the genre and the nearest reference shows; what the drama is never allowed to become (for example, "tense but never gory," or "funny but never mean"); the pacing default (do scenes breathe, or do they cut hard); and the emotional register of the ending you are writing toward. When you hand a scene to yourself two months later, the tone guide is what stops a comedy from curdling into a thriller by accident.

Keep it prescriptive and keep it short. A tone guide that runs three pages is a second script no one will read. The point is a page you can glance at before you write a new scene.

Format the whole bible for retrieval, not for reading cover to cover. A single document with clear headings - characters, world rules, tone, sound continuity - beats a sprawling wiki for a solo creator or a small team, because you only ever open it to answer one question. Put the character entries first, since that is what you check most, and keep the locked-voice assignments together so a casting pass is one glance.

Keeping the bible and the audio in sync as the series grows

This is the part that separates a bible that works from a bible that rots. A reference document is only canon if it matches what actually got recorded, and a serialized show changes under you: a minor character becomes a lead, a voice you cast in episode one turns out wrong for the arc, a world rule bends to serve a better scene.

Three habits keep them in sync. First, update the bible the moment a change is final in the audio, not "later" - later never comes. Second, version it lightly: date each change so you can see when a voice or a rule shifted, which matters when you re-render an older episode. Third, when you recast or revise a line, re-render only the affected span rather than the whole episode, and then correct the bible entry in the same sitting. Because the voice is cast per character, a single character's reassignment is a contained edit, not a from-scratch rebuild - which is exactly why the bible's locked-voice line has to stay accurate.

How AudioProducer fits a series bible workflow

AudioProducer.ai turns the bible's casting canon into finished audio. You paste or import your script, cast a voice per character with Auto-Assign, and the locked voice assignments in your bible become the casting you apply episode after episode, so a character sounds like themselves across the whole run. The output is an MP3 you download and distribute yourself - AudioProducer does not publish to any store - so the bible stays your single source of truth for who is who. When a character's entry changes, you re-render that character's lines and update the sheet, keeping canon and audio aligned.

If you are standing up a serialized show, pair the bible with the pilot-writing post for the first episode and the season plan for the schedule. For more craft guides, browse all articles. Start free on AudioProducer.ai and cast your first character today.

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