Develop a film idea

Develop a film idea · Part 3 of 6

Beat Sheets & Act Structures

Shape the premise into beats that fit your runtime.

A beat sheet is the movie as a sequence of turns, not a list of scenes. Take the locked logline and the character bibles and map who chooses what, when it costs them, and what is different after each turn. If a beat does not change a want, a lie, or a relationship, it is not a beat.

What is a beat sheet?

A beat is a moment that changes the direction of the plot, the power in a relationship, or what the hero is willing to do. A beat sheet is those moments in order, written before you draft pages.

It is not a scene list.

“They go to the warehouse” is a location.

“She realizes he has been lying since the hotel” is a beat.

You can use more than one structure language. Pick one for the first pass and stay inside it.

Save the Cat (15 beats) is the most common shared map. Official beats

  1. Opening Image
  2. Theme Stated
  3. Set-Up
  4. Catalyst
  5. Debate
  6. Break into Two
  7. B Story
  8. Fun and Games
  9. Midpoint
  10. Bad Guys Close In
  11. All Is Lost
  12. Dark Night of the Soul
  13. Break into Three
  14. Finale
  15. Final Image

Field is three acts and two plot points plus a midpoint. McKee is controlling idea, inciting incident, progressive complications, crisis, climax. The job is the same. Name the turns. Do not decorate them.

Star Wars: A New Hope

Opening image: a tiny ship swallowed by a Star Destroyer.

Catalyst: the droids and the message reach Luke.

Break into Two: he leaves Tatooine with Ben.

Midpoint: they reach the Death Star and the rescue becomes a trap.

All Is Lost: Ben is killed.

Finale: Luke fires, the station dies, the farm boy is gone.

The Godfather

Opening image: a man begs Don Corleone for justice at a wedding.

Catalyst: Vito is shot.

Break into Two: Michael kills Sollozzo and McCluskey.

Midpoint: exile in Sicily, a marriage, a brief peace that cannot last.

All Is Lost: Apollonia is murdered.

Finale: Michael takes the chair and shuts the door on Kay.

Both films work because each listed turn makes the next one necessary. Cut the midpoint and the finale is a different movie.

What to start with

  • The locked logline
  • Want, need, and lie for the protagonist and the antagonist
  • The two relationships that matter
  • The hard limits you already set (runtime, arena, rating)
  • One named spine (Save the Cat unless you have a reason not to)

Do not start by asking for “an outline of the movie.” That is how you get travel, conversations, and a twist taped on at the end.

Two passes only

Pass A. One sentence per beat. No dialogue. No camera. If you cannot fill a beat, the idea still has a hole.

Pass B. Turn each beat into a scene card: where, who wants what in the room, what has changed when the card ends.

Do not write pages between the two passes. The sheet is the test. Pages come after the test passes.

Force the beats to do character work

Each beat should poke the bible.

  • Opening image shows the Tuesday they have settled for.
  • Catalyst makes that Tuesday impossible.
  • Debate is the lie talking.
  • Break into Two is the first choice they cannot take back.
  • Midpoint raises the want or exposes the lie. It is not “something big happens.”
  • All Is Lost takes the want, or takes the person they were using.
  • Finale costs them the lie even if they get the goal.

If Fun and Games is only cool set pieces, you paused the movie.

Worked swap (keep the engine, change one turn)

Base logline: After a pop star’s bodyguard witnesses a murder, he must keep her alive long enough to testify, or the syndicate erases them both.

Pass A, bodyguard as lead (short map)

  • Opening image: he stands behind her at a premiere and no one looks at him.
  • Catalyst: he sees the killing.
  • Debate: quit tonight or become the problem.
  • Break into Two: he puts her in the car and does not call the police.
  • Midpoint: they go public and survive the first night. False win.
  • All Is Lost: the syndicate reaches someone she trusted. The testimony is worthless.
  • Finale: he gets her to court and loses the job that was his whole identity.

Midpoint swap (same people, different movie)

  • Midpoint: she fires him on camera to prove the threat is a stunt.
  • What follows Then Bad Guys Close In is her alone in the machine she built.
  • Where it lands All Is Lost hits her lie (“fame is armor”), not his.

Point at the cell you changed. One turn. If you also moved the murder, the tour, and the ending, you started a new pile.

Kill test

The cord of index cards now has gaps. A tracked robot holds a card over the campfire where others burn, and the filmmaker stands back with arms crossed, studying the line.

Make the model argue against the sheet.

  • Which beat repeats the one before it?
  • Where does the protagonist stop choosing and start being driven?
  • If we cut the twist, does Act Two still turn?
  • Can you describe Fun and Games without naming a location? If not, it is tourism.
  • Does Final Image answer Opening Image, or did you forget the first picture?

If you cannot say the midpoint and All Is Lost out loud, the sheet is not locked.

Using AI as a writing partner

Stay on one named spine. Demand sentences, not pages.

Paste into your AI chat

You can swap “Save the Cat” for Field or McKee in line one of the brief. Do not mix them in the same pass. A Google sample prompt already asks a model for a Save the Cat sheet plus a character table, with a scene description on every plot point. Steal the shape. Keep the choices yours. Vertex sample

Next: Building a World