Sial IV (1969): cast, story & where to watch
1969 · Series · ★ 5

Released in 1969, Sial IV is a sci-fi & fantasy and mystery series.
What it’s about. Sial IV is a Swiss television miniseries by Greek filmmaker and writer Adonis Kyrou, adapted from the speculative fiction novel Deadly Image (AKA The Uncertain Midnight) by British author Edmund Cooper. It tells the story of Denis Lange (Henri Gilabert), a fallout shelter engineer who is accidentally trapped in suspended animation as war breaks out in 1970, only to awaken in the early 2100s in Sial IV, an underground city in which humankind lives a life of leisure, having discharged all responsibility to androids. Assigned the android Diana as his personal assistant, Denis ventures through this unsettling idyll, eventually finding a small but tenacious group of resistors who seek to uncover the truth about the compound and its ruler, the mysterious Machiavelli.
Who’s in it. Sial IV stars Lise Lachenal as Diana, François Chodat as Tibère, Claude Cerval as Nathanaël de Geoffroy and Henri Gilabert as Denis Lange, among others.
How it landed. With an audience score of 5.0/10, Sial IV has proved divisive with audiences.
Where to watch. Streaming options change often. See the full, country-by-country breakdown on our where to watch Sial IV page.
If you liked it. Fans of Sial IV tend to enjoy Rick and Morty, Demon Slayer: Kimetsu no Yaiba, Attack on Titan and Attack on Titan: No Regrets.
Frequently asked
- Where can I watch Sial IV (1969)?
- Streaming, rental and purchase options for Sial IV change frequently. Check our where-to-watch page for the latest availability in your country.
- Is Sial IV worth watching?
- Sial IV holds an audience score of 5.0 out of 10, and is a strong pick if you enjoy sci-fi & fantasy and mystery. Reactions are mixed, so it may depend on taste.
- Who stars in Sial IV?
- Sial IV stars Lise Lachenal, François Chodat, Claude Cerval, Henri Gilabert and Marcel Dalio.
- When was Sial IV released?
- Sial IV was released in 1969.
