Lights Down — what movie do we watch?Pick tonight's movie →
Lights Down › Tonight's lists › Sci-fi movies under 2 hours › Demon Seed

Where to watch Demon Seed (1977) tonight

Demon Seed (1977) runs 1 h 34 min, is rated R in the US and averages 5.9 from 287 TMDB members. A scientist creates Proteus, an organic supercomputer with artificial intelligence which becomes obsessed with human beings, and in particular the creator's wife.

Runtime
1 h 34 min — ends 9:34 pm if you start at 8:00 pm
Rated
R (US)
Genres
Horror, Science Fiction
Released
April 7, 1977
TMDB rating
5.9 / 10 from 287 votes
Director
Donald Cammell
Starring
Julie Christie, Fritz Weaver, Gerrit Graham, Berry Kroeger
Language
English
Good for a group? Yes — a crowd movie.Horror and Science Fiction hold a room: people can talk, laugh or scream over it and still follow what is going on. Rated R in the US — check who is in the room.

Where to watch it tonight

Availability loads live for your country. See where Demon Seed streams (JustWatch via TMDB) →

Streaming availability by JustWatch. In the US, as of 2026-11-06: fuboTV (subscription), Chilling (subscription), Fawesome (free), The Roku Channel (free with ads), Plex (free with ads), Mometu (free with ads), Tubi TV (free with ads).

Is it on your services tonight?Tell Lights Down which streaming services you have and how long you've got; it ranks what you can stream tonight. Free, no login.

Questions people ask

How long is Demon Seed?
Demon Seed is 1 h 34 min long (94 minutes). If you start it at 8:00 pm it ends at 9:34 pm; add about 20 minutes if you watch trailers first.
What is Demon Seed rated?
Demon Seed is rated R in the US.
Is Demon Seed a good movie to watch with a group?
Yes — a crowd movie. Horror and Science Fiction hold a room: people can talk, laugh or scream over it and still follow what is going on. Rated R in the US — check who is in the room.
Where can I stream Demon Seed?
In the US, as of 2026-11-06: fuboTV (subscription), Chilling (subscription), Fawesome (free), The Roku Channel (free with ads), Plex (free with ads), Mometu (free with ads), Tubi TV (free with ads). Availability changes often; this page loads the live list for your country (streaming availability by JustWatch).

Lists it could be on

If you like Demon Seed

Demon Seed on TMDB · This product uses the TMDB API but is not endorsed or certified by TMDB.

Demon Seed poster

Lights Down is a free tool: tell it your streaming services and how long you have, and it ranks what you can stream tonight, with a this-or-that, a roll, a bracket and a wheel. Movie data from TMDB; streaming availability by JustWatch. Page updated 2026-11-06. TMDBThis product uses the TMDB API but is not endorsed or certified by TMDB. Lights Down is a Somebody Decide program. How the data works · Legal & privacy · Tonight's lists