Swap One Character for Another in a Clip You Already Have

Quick answer: Open Edit this clip → AI visuals → Swap person. Under Who pick the person to replace, under Swap with pick the character who should be there, and press Edit into a new version. The acting, the position and the lines stay as they were; the face, hair and clothes come from the new character’s sheet. It costs 2× the per-second price of the clip’s tier for the length of the clip.

Still from “The Last Envelope”, an AI short drama generated end-to-end by SceneMixer (6 characters, 1 episode) — Sample: “The Last Envelope” — Realistic HD, 1 episode, produced end-to-end by SceneMixer from the script · watch the episodes

Typical use: the right scene, the right performance, but the wrong face — for example two similar-looking characters got mixed up in one clip.

What you need first

The replacement must be a character of this project with a character sheet, because the sheet is where the new face comes from. Swap with lists only characters that have one, and never the person you are replacing. If the project has fewer than two characters, or nobody has a sheet yet, Swap person is greyed out. To bring in someone new, add them to the asset library and generate or upload their sheet first. Add a character to this episode.

Step by step

Select the segment and open Edit this clip → AI visuals.
For a clip over 15 seconds, choose the half to edit.
Click Swap person.
Under Who, click the person to replace; people who appear in this segment are listed first.
Under Swap with, click the character who should be there.
Press Edit into a new version; the price is on the button.

What carries over and what changes

The performance carries over: the same movements, the same place in the frame, the same timing and the same lines. What changes is the person: face, hair and outfit follow the new character’s sheet — including the outfit, so if the sheet shows a coat, the coat comes along. If the voice should change as well, run Redub on the result and pick the new character’s voice. Change a character's voice.

It changes this clip only

The storyboard still names the original character, so if you regenerate the segment the original comes back. For a real recast — the part should be played by someone else from now on — change the character’s sheet instead and regenerate the segments, or edit the storyboard so the other character is named in those shots. Replacing a character sheet.

When a swap will not help

A swap replaces one person with another in the same place. It cannot take out an extra person who should not be in the shot, and it cannot fix a clip where the same character appears twice. Those come from the storyboard: check who the shot names and regenerate. Who is in frame.

Stays as in your clip	Comes from the new character's sheet
Movements and acting	Face
Position in the frame and framing	Hair
Timing and spoken lines	Clothes and accessories on the sheet

FAQ

Can I swap in someone from another project?

Not directly. Copy the character into this project first so it has a sheet here, then swap. Reuse a character across projects.

Why is Swap person greyed out?

The project needs at least two characters, and the one you swap in needs a character sheet.

Does the voice change?

Swap changes how the person looks. To change how they sound, redub the result.

Can I swap two people at once?

No. One swap per edit; run another edit on the result for the second person.

Put the right face in the scene

Same performance, different character, the original kept in the history.

Open your project

Updated September 30, 2026