How to Make a Horror Movie With AI in 6 Steps

Most AI horror clips are a monster and a jump scare, and they stop being scary the second time you watch them. Dread comes from choices you repeat in every shot: what the light is, what the viewer hears, and what the camera refuses to show. We read the 420 video prompts behind Xenogenesis, a sci-fi horror film of nearly 18 minutes by Gertywood from the Summer 2026 Flick Residency, to see how those choices were written. This guide shows how to make a horror movie in six steps, each with a real shot and the prompt that made it.

How do you make a horror movie with AI, step by step?

1. Step 1

   Find the fear

   Start from one fear the audience already carries and put it somewhere the hero cannot leave, because a horror idea works when the threat follows the character into every room.

   • Xenogenesis puts the threat inside its hero: a bump on Cole's back with something alive in it.
   • The prompt names the scare as a single beat: "a single distinct push against the skin from within."
   • The bump grows in stages, with reference images named Cole 10% in 33 prompts and Cole 20% in 55.

   00:08

   Use Hf 20260728 062156 34a47b46 C1a9 4e1f B6bb 9f78c7866bd3 as the exact start frame — Cole shirtless at the mirror, examining the swelling on his back.
   Use Cole's Voice as what Cole's voice sounds like.
   Identity lock — Cole has heterochromia: his right eye (on the viewer's left) is blue-grey, his left eye (on the viewer's right) is brown. Do not normalize both eyes to the same color.
   Single continuous shot.
   Start frame 100% exactly on Hf 20260728 062156 34a47b46 C1a9 4e1f B6bb 9f78c7866bd3: Handheld, shaky. Cole is very nervous, fighting to control his fear, looking over his shoulder into the mirror at the swelling on his back. He reaches back slowly and gingerly, for only a split second, taps his fingertip against the bump in the middle of his back, immediately lifting his finger away from the bump after touching it just one time for a fraction of a second. Then after that, Something inside the bump, beneath the skin, pulses upward once, stretching his skin so we can see the wrinkle lines form along the outer edges of the bump. It is a single distinct push against the skin from within. Cole gasps and his hand jerks back. He looks up at his own reflection with abject terror.
   Blocking: Cole angled to the mirror, back's swelling visible in the reflection; his hand reaching to tap the lump; the single internal pulse; his hand recoiling; his eyes snapping up to his reflection in horror.
   Performance: Cole is holding himself together by a thread — the tap is tentative, dreading what he'll feel, breath held. The pulse shatters the composure: a sharp involuntary gasp, hand flinching away, and then pure terror flooding his face as he meets his own eyes in the glass, the full horror of what's inside him landing.
   Camera: handheld shaky, holding on Cole and his reflection through the tap, the pulse, and the terrified look up.
   Style: handheld, shaky camera, cinéma vérité. 35mm film emulation, halation, bloom, shallow depth of field with hexagonal bokeh.
   Audio: no music, no score. Bathroom ambience, Cole's held, shaky breath, a sharp gasp at the pulse, then frightened breathing as he stares at his reflection.

2. Step 2

   Set the light and palette

   Choose two or three colours and one quality of light for the whole film, then repeat them in every prompt, so each scene feels like the same place the viewer cannot get out of.

   • The title sequence sets the palette: a slick black skin with "faint bioluminescent red veins", and the title in metallic red.
   • The mirror scenes add the light: "Cool blue key light dominating, warm red practical source bleeding in from the left, deep shadow contrast."
   • One film line, "35mm film emulation, halation, bloom, shallow depth of field with hexagonal bokeh", appears in 323 of the 420 video prompts.

   00:10

   Generate a 15-second, 16:9 sci-fi horror title sequence. Full-frame extreme close-up throughout — never a wide shot.
   
   Shot 1 (0–11s): Camera dollies slow and lateral across a dark, wet, organic surface — pulsing membranes, faint bioluminescent red veins throbbing beneath a slick black skin. We're pressed so close the shape never resolves into a readable object. Over this, the word "XENOGENESIS" fills the frame letter by letter, huge, in a cold elongated sci-fi typeface — thin geometric strokes, wide letter-spacing, sharp serif tips, metallic red. Each letter flashes on and off at high speed, strobing, as the camera dollies past it before the next letter ignites. Sound: a slow mechanical pulse synced to the organic throb, with a harsh electronic zap on every letter-flash.
   
   Shot 2 (11–15s): Hard cut to black. Centered, modest-sized text in the same typeface reads: "STARTS NOW." Static, no flashing, holds for the remainder. Sound: the pulse cuts dead on the black cut, one low sustained tone, then silence.

3. Step 3

   Write the characters

   Write each character as appearance, personality and arc before you generate a face, and give every one a job in the fear, such as the survivor whose warning nobody believes.

   • Gertywood generated five character profiles with GPT Image 2, from Mom and Dad to the doctor, each one from a written profile like this.
   • The post-op teen's profile explains his scream before he has one: "Whatever social instinct told him to stay calm has been burned out by what he went through."
   • One trait ties the monster to the hero: Cole's blue-grey and brown eyes, locked in 136 prompts and given to the creature in 18.

   

   # POST-OP TEEN — Character Profile
   
   **Age:** 17–18
   **Ethnicity:** White American
   
   **Appearance:** Gaunt and visibly traumatized. His shoulder is bandaged — recently operated on, the wound still fresh under the dressing. He's in a hospital gown over street clothes, like he got here under his own power and never fully changed. Sunken eyes, dry lips, shaking hands. He looks like someone who has been awake for 36 hours straight because something inside him wouldn't let him sleep.
   
   **Personality:** Desperate and completely unhinged by what he's survived. He is not performing panic — he has earned it. He screams at Cole with the specific urgency of someone who knows exactly what's coming and has run out of polite ways to say it. There's no filter left. Whatever social instinct told him to stay calm has been burned out by what he went through.
   
   **Arc:** He is the survivor — which makes him the most important person in the clinic and the one nobody listens to. His frantic warning to Cole is the scene's emotional core and its cruelest beat: Cole sees him, feels relief at not being alone, then reads the terror in his face and runs — but runs from the clinic, not from the operation. He survives. Cole doesn't. He will spend the rest of his life knowing he tried.

4. Step 4

   Shoot the scare

   Give each scare one camera move that tips the viewer off balance, and keep the quiet scenes steady, so the moment the frame lurches the audience feels it before they understand it.

   • Cole's moment of terror is a vertigo move, a zoom in while the camera pulls back, with a hard Dutch tilt that cants the frame off its axis.
   • 232 of the 420 video prompts ask for a handheld camera, mostly "handheld, shaky".
   • The calm scenes ask for "smooth and methodical camera movement" instead, in 61 prompts.

   00:05

   Use Cole S13G strictly as the visual reference for Cole and his framing and blocking in the scene
   Use Cole 20% Bump as the bump on Cole's back.
   Use Cole Eyes as 100% the color of Cole's eyes.
   Use Apartment 6 Couches as the grey couch.
   use Kid in Yellow Shirt With Bump as the guy in the yellow shirt. 
   single continuous shot, no cuts. 
   Action. close up medium of cole sitting in the couch on the right, the back guy sitting on the left grey couch behind him. Cole is looking slightly off center frame right with worried, terrified eyes. The camera zooms in and pulls out at the same time performing a vertigo camera move, it also cants into a hard dutch tilt, the whole vertical frame tipping off-axis so that Cole's face is slanted in the frame. During this camera move, Cole's expression becomes one of abject terror like having seen the devil. He's so scared he falls backwards out of his seat towards frame left, causing the guy in the yellow shirt in the back to react and say, "Yo watch out!" Cole scrambles off frame left. 
   Style: horror film. 
   Camera: 2 moves at the same time, vertigo camera move and canting horizonal axis. 
   audio: no music. Cole falling out of the couch.

5. Step 5

   Score it with silence

   Rule out music in every prompt and write the sounds instead, because a scream behind a curtain or a bone saw you never see frightens more than any score.

   • 398 of the 420 video prompts ask for no music, 326 of them in the same words: "Audio: no music, no score."
   • Here the operation stays behind plastic: the viewer hears the screaming and the saw, then the camera pans to a man who has survived it.
   • Name small, close sounds, as the mirror scene does with "the small wet shift of the bump moving beneath his skin".

   00:13

   Use Post Op Voice as what the bandaged man's voice sounds like.
   Use INT. Apartment 6, surgery area as the visual reference for the operation behind the hanging plastic curtains.
   Use INT. Apartment 6, Beds as the visual reference for the clinic beds and equipment.
   Use Post op Teen Best as the visual reference for the bandaged man.
   Single continuous shot.
   Action: handheld shaky long lens close-up, angled from the left of the operation happening behind the hanging plastic curtains — surgeons hunched over a body, silhouetted through the sheeting. A man's ragged screaming carries from beyond it, mixed with the buzz of a bone saw. Blood splatters across the plastic in sudden arcs. A quick pan left lands on a close-up of another man lying on his stomach on the clinic beds, back bandaged and facing up at the ceiling, his head at the foot of the bed, looking directly into the lens. He has an IV in his arm connected to the amber IV bag in the background of INT. Apartment 6, Beds. His face is panicked, urgent, a warning. He whispers, weak and sickly: "D-Don't do it." A pause. Then his voice climbs to something shrill and unhinged: "Don't do it! They'll tear your soul out! Hear me! Don't do it! Run! Get out! Don't let them take your baby!" He reaches a trembling hand out toward camera, urging someone off screen.
   Performance: The bandaged man wants to save whoever's out there before it's too late — play it as a survivor who's already been through it and come back wrong, the whisper cracking into raving, the reaching hand desperate, his eyes fixed and burning with a conviction nobody in the room will believe.
   Camera: handheld shaky long lens, opening angled left on the curtained operation as blood hits the plastic, then a quick pan left settling on the bandaged man's close-up, holding as he whispers, escalates, and reaches toward camera. No cuts.
   Style: handheld, shaky camera, cinéma vérité. 35mm film emulation, halation, bloom, shallow depth of field with hexagonal bokeh.
   Audio: no music, no score. The man's ragged screaming behind the curtain, the whine and bite of the bone saw, wet spatter against plastic, clinic hum, the bandaged man's sickly whisper close on the mic, his breath catching, then the shrill cracked escalation of his raving, the creak of the bed as he reaches out.

6. Step 6

   Cut on the reveal

   Write the cut into the prompt and start each clip from the last frame of the one before, so the reveal lands on a hard cut and the scene never jumps between generations.

   • The creature's birth is two shots in one generation: a shaking close-up, then "Hard cut to a bird's-eye high above".
   • 34 of the 420 video prompts continue from the last frame of an earlier clip, so one scene plays across several generations.
   • After the screaming, the prompt holds a quiet beat: the creature "cocks its head in curiosity at Cole".

   00:12

   Use Cole's Voice as what Cole's voice sounds like.
   Use S14E Profilestrictly as the visual reference for Cole and his framing in the scene.
   Use Cole Eyes as 100% the color of Cole's eyes.
   Use Untitled Image as the visual reference for the ground-floor space.
   use Creature Profile Sheet Wonder 3as the creature.
   Identity lock — Cole has heterochromia: his right eye (viewer's left) is blue-grey, his left eye (viewer's right) is brown. Intentional; never normalize both eyes to one color.
   Single continuous shot.
   continuing exactly 100% from the last frame of S14G Ext Ref, use the exact same character performance and blocking. Two shots with a hard cut.
   Action: handheld shaky extreme close-up, front-on Cole. He's shaking like a leaf. He stammers: "O-okay! Okay!" and places his hands on top of his head. Then a spike of pain hits him — his face contorts and he collapses onto his knees. Hard cut to a bird's-eye high above, diving fast down toward him as he tilts his face to the sky, screaming, features twisted. in the same shot the camera plunges and lands tight on the bump on his back — just as the creature's beak punches through it, tearing through the orange sweater. It rips itself free of his back, tearing both Cole's skin and the orange sweater, revealing a gaping hole in cole's back where the creature emerges from. It shakes off blood and viceral and screeches. Cole is writhing and screaming the entire time, hands reaching back towards the creature in a futile effort to stop the pain. the creature turns, meets Cole's eyes, a moment between it and him, where maybe there's some innocence to the new born creature. It cocks its head in curiosity at Cole. Cole, shaking from pain and torment, gasping for breath whispers, "oh - oh god." 
   Performance: Cole's compliance collapsing into agony mid-sentence, then pure animal terror as something opens him from the inside; the creature emerges violent and immediate, no hesitation.
   Camera: handheld shaky extreme close-up on Cole, hard cut to a bird's-eye plunge from high above onto his upturned screaming face, continuing down to a tight shot on the bump as the beak breaks through, holding for the emergence and the lunge. One hard cut.
   Style: handheld, shaky camera, sci-fi action movie. 35mm film emulation, halation, bloom, shallow depth of field with hexagonal bokeh.
   Audio: no music, no score. Drone whine, spotlight hum, Cole's shaking stammer close on the mic, his scream tearing out, the wet rip of the bump splitting and fabric tearing, the creature's shrill screech. 

   Open the Xenogenesis workflow

Where do good horror movie ideas come from?

Questions about making a horror movie

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Film in this guide

• Gertywood · Xenogenesis