A sci-fi feature film typically runs 100-120 pages and is defined by speculative storytelling that explores big ideas through a futuristic, technological, or alternate-reality lens. the best sci-fi uses its world to examine human nature.
World-building must be organic — revealed through character experience, not exposition dumps. The 'one big idea' rule applies: ground the story in a single speculative premise and explore its implications thoroughly. Technology should create dilemmas, not solve them. Visual descriptions of the world need to be specific and cinematic. Jargon should be minimal and context-clear. The human story must work even if you strip away the sci-fi elements.
Act one establishes the world and its rules while introducing the protagonist's personal stakes (25-30 pages). Act two explores the implications of the central premise through escalating conflicts, with a midpoint discovery that reframes the story (50-55 pages). Act three brings the personal and thematic stakes together in a climax that answers the story's central question (25-30 pages).
Define your one big idea — the single speculative element that makes your world different from ours.
Build the world through character experience, not exposition. Let the audience discover the rules alongside the protagonist.
Ground the speculative concept in a deeply human story. Strip away the sci-fi and the emotional core should still work.
Create a glossary for yourself but keep jargon to a minimum in the script. If a reader has to pause to decode terminology, you've lost them.
Free Screenwriter gives you industry-standard formatting, AI coverage, and structure tools — everything you need to write a sci-fi feature film.
Start Writing — FreeNo credit card. No trial. Free forever.