Plot Structure (Ghostbusters) Ghostbusters (1984)

Quadrant: Better tools, sufficient — classical comedy.

Initial approach: Contain. Trap each ghost individually with proton streams, store it in the grid, observe the cardinal rule (don't cross the streams), and operate as a regulated small business that the city's institutions can live with.

Post-midpoint approach: Weaponize the prohibition. When the containment apparatus fails — and the institutions that were supposed to coexist with it become the agent of failure — the only move is to deliberately violate the team's own cardinal rule and use the forbidden technique to close the gate.

---

Equilibrium. Weaver Hall psychology lab. Venkman runs an ESP card test on two volunteers, shocking the male student for every "wrong" answer and waving the female student through her wrong answers as evidence of psychic talent.^b2 Paranormal research as university-funded flirtation; the protagonist in his element inside an institution that does not require results.

Inciting Incident. Stantz arrives mid-experiment and pulls Venkman out: a full-bodied free-roaming vapor in the New York Public Library stacks.^b3 The team descends into the basement, finds the librarian-ghost, and Stantz's plan ("Get her!") sends them running.^b4 The "research" frame meets a real ghost on its own terms.

Resistance / Debate. Brief. Stantz wants to study the readings; Venkman wants the credit. The real resistance is institutional — Dean Yeager calls them in and terminates the grant, citing sloppy methods and popular tripe.^b5 Venkman's actual stance toward leaving the academy collapses into a one-line resolution rather than a debate.

Commitment. Outside Weaver Hall, after the firing. Venkman tells Stantz that for whatever reason — fate, luck, karma — they were destined to get thrown out of this dump, "to go into business for ourselves."^b6 A single bounded scene; the project is named, and from here the team is no longer trying to stay in the academy.

Rising Action. Mortgage on the Stantz family house, the firehouse opens,^b7 the proton-pack training in the storage facility (Egon's "don't cross the streams" speech),^{b16 b22} Janine answers the first call,^b12 the Sedgewick Hotel job — Slimer cornered in the ballroom, the trap deployed, Venkman covered in ectoplasm.^{b15 b17} The containment approach in full execution: drive the truck, light the packs, close the trap.

Escalation 1. The Sedgewick capture itself. "We came, we saw, we kicked its ass!"^b18 The approach is operating at maximum visibility; the press is there, the client is paying, the team is on every front page.^b19 The pressure is success — the franchise scales, Winston is hired,^b20 the grid fills, and the EPA notices.^{b23 b24}

Midpoint. The firehouse, ~64m. Walter Peck arrives with a power-company technician and a police officer and orders the containment grid shut down.^b30 The technician throws the breaker; the grid breaches; every ghost the team has ever caught explodes outward across Manhattan.^b31 The containment approach is broken in one bounded scene — not because the apparatus failed but because the institution it depended on switched it off.

Falling Action / new approach. The team is arrested, then ushered into the mayor's office.^{b31 b33 b35} They explain that Dana Barrett's apartment building is a transdimensional antenna designed in 1920 by Ivo Shandor as a Gozer-summoning structure,¹ and that the released ghosts have been converging on it.^b32 The new approach is articulated here: the threat is the building, not the ghosts; the city is the operational frame, not the EPA; and whatever they do at the rooftop will not be containment. Winston's "if someone asks you if you're a god, you say YES" is the new approach's operating wisdom — pragmatism scaled up to apocalyptic stakes.²

Escalation 2. The mayor's office showdown — Venkman pitches "dogs and cats living together" and the cardinal nods.^b35 Peck is dragged out. The team is given a police escort up Central Park West.^b36 The field of play changes from regulated-business-defending-itself to deputized-defenders-heading-toward-an-actual-god, and the stakes ratchet up to citywide.

Climax. The rooftop temple.^{b37 b38} Gozer demands the team choose the form of the destructor; Stantz's mind betrays him and Mr. Stay Puft strides up Fifth Avenue.^{3b39 b40} The four men fire on the marshmallow god and the Temple Gate without effect; Spengler proposes reversing the particle flow through the gate; Venkman names it — "You're saying cross the streams". They cross. The gate closes; Stay Puft burns; the team's cardinal rule has been deliberately violated and the violation is what works.^b41

Wind-Down. The roof clears. Dana and Louis emerge from the rubble of the temple.^{b42 b43} The team descends to the street through cheering crowds, an ectoplasmic mess and Slimer kiss for Stantz, Venkman lifts Dana into Ecto-1.^b43 The new equilibrium incorporates the success: the team is the city's defenders rather than its nuisance, Dana is alive and present, the franchise is validated rather than shut down.

---