Alien Terror
Invasión Siniestra
We checked 8 streaming services in India on 05 Jun 2026 at 11:46 IST
About
Near the end of the 19th century, Prof. John Mayer and his assistant, the scientist Dr. Isabel Reed, accidentally invent a powerful ray. An alien travels to Earth to destroy the machine since it would be a threat to the universe. He initially possesses the mind of Thomas, a sex maniac and serial killer, to get close to Mayer during the demonstration of the machine to scientists and the military. Mayer's niece, Laura, meets an acquaintance of her uncle, the chemist Dr. Paul Rosten, and Mayer invites him to join the research. When Thomas gets close to Mayer, the alien also possesses his mind in order to destroy the device and his notes. Meanwhile, Thomas is not able to control his murderous impulses and attacks several women with a straight razor.
Cast
Boris Karloff
as Prof. John Mayer
Enrique Guzmán
as Dr. Paul Rosten
Christa Linder
as Laura
Maura Monti
as Dr. Isabel Reed
Yerye Beirute
as Thomas
Tere Valez
as Nancy
Griselda Mejía
as Prostitute
Sergio Kleiner
as Alien
Mariela Flores
as Deaf-mute victim
Tito Novaro
as Gen. Nord
Sergio Virel
as Villager
Nathanael León
as Villager
Carlos León
as Villager
Rosángela Balbó
as Martha - mayor's wife
Julián de Meriche
as Visiting Dignitary
Arturo Fernández
as
Where does Alien Terror rank today?
Alien Terror is #10000 on the CineFlixo Daily Streaming Charts today.
- Highest: #10000
- Top 10: 0 days
- Top 100: 0 days
Watch Alien Terror Online Free in HD
If you've been searching for Alien Terror full movie in HD, CineFlixo has you covered. This talked-about Español horror and science fiction title from 1971 is available to stream instantly — no ads to fight through, no paid subscriptions, no annoying redirects.
About Alien Terror
Near the end of the 19th century, Prof. John Mayer and his assistant, the scientist Dr. Isabel Reed, accidentally invent a powerful ray. An alien travels to Earth to destroy the machine since it would be a threat to the universe. He initially possesses the mind of Thomas, a sex maniac and serial killer, to get close to Mayer during the demonstration of the machine to scientists and the military. Mayer's niece, Laura, meets an acquaintance of her uncle, the chemist Dr. Paul Rosten, and Mayer invites him to join the research. When Thomas gets close to Mayer, the alien also possesses his mind in order to destroy the device and his notes. Meanwhile, Thomas is not able to control his murderous impulses and attacks several women with a straight razor. Running 90 minutes.
Alien Terror Cast and Characters
The cast features Boris Karloff (as Prof. John Mayer), Enrique Guzmán (as Dr. Paul Rosten), Christa Linder (as Laura), Maura Monti (as Dr. Isabel Reed), and Yerye Beirute (as Thomas). Their performances are a major reason Alien Terror has built such a passionate audience.
Where to Watch Alien Terror Online
Want to watch Alien Terror online without paying? CineFlixo is the easiest way. Click play and the film starts in seconds. No popups, no "5 day trial that auto-charges" — just the show.
▶ Watch Alien Terror NowWhy People Are Watching Alien Terror
Alien Terror flies under the radar but it deserves your attention. What makes it work is world-building that respects the audience's intelligence. If you enjoy Español storytelling that doesn't follow the same tired beats, this is the kind of film you'll end up recommending to friends.
Frequently Asked Questions about Alien Terror
Where can I watch Alien Terror online for free?
You can watch Alien Terror online free on CineFlixo. Just open the page and hit play — no signup, no subscription, full HD streaming on phone, tablet, or desktop.
How long is Alien Terror?
Alien Terror runs for 90 minutes (about 1.5 hours).
Is Alien Terror good? What's the rating?
Alien Terror holds a 3.6/10 rating based on 26 reviews — a niche pick worth checking out.
Who is in the cast of Alien Terror?
The main cast includes Boris Karloff, Enrique Guzmán, Christa Linder, and Maura Monti, plus a strong supporting ensemble.
Is Alien Terror available in Español?
Yes — Alien Terror was originally produced in Español and that's the version you'll stream here on CineFlixo. English subtitles are provided when available.
When was Alien Terror released?
Alien Terror was released in 1971.
Do I need an account to watch Alien Terror on CineFlixo?
No. CineFlixo is free and you can watch Alien Terror without creating an account. Sign-up is optional — only useful if you want a personal Watchlist or to comment on episodes.
Similar Movies You Might Like
If you enjoyed Alien Terror, check out The Thing from Another World, The Invisible Man, Lupe Q and the Galactic Earworms, Beyond Re-Animator, and Invasion of the Body Snatchers.
💬 Comments0
Join the conversation
Share your thoughts, rate episodes, and connect with other fans
Hey everyone! 👋 Welcome to the discussion.
Feel free to share your thoughts about this series — what did you love, what surprised you, which episodes are your favorites? 🎬
Got ideas for what we should add to CineFlixo? Want to suggest a series? Drop it here! We read every comment ✨
Similar Movies
Movies like this one
Recommended for You
Based on this movie
Similar Movies
More horror movies you might enjoy
Disforia
2025
The Photographer
2025
Mexican Psycho
2026
The Whisper
2026
In Darkness We Fall
2014
Apocalypse Z: The Beginning of the End
2024
Come Play With Me
2021
![[REC]](/_next/image?url=https%3A%2F%2Fimage.tmdb.org%2Ft%2Fp%2Fw300%2FhgyJR4sgMsee6xMFM3xYiG6cDCh.jpg&w=1920&q=65)
[REC]
2007
The Platform 2
2024
I Am Frankelda
2025
Don't Follow Me
2025
The Skin I Live In
2011
Frequently Asked Questions
Common questions about Alien Terror
Where can I watch Alien Terror for free?
You can watch Alien Terror (1971) online for free on CineFlixo. Just click "Watch Free" on this page to start streaming instantly — no account, subscription, or downloads required.
What is Alien Terror about?
Alien Terror is a Horror/Science Fiction film. Near the end of the 19th century, Prof. John Mayer and his assistant, the scientist Dr. Isabel Reed, accidentally invent a powerful ray. An alien travels to Earth to destroy the machine since it would be a threat to the universe. He initially possesses the mind of Thomas, a sex maniac and serial killer, to get close to Mayer during the demonstration of the machine to scientists and the military. Mayer's niece, Laura, meets an acquaintance of her uncle, the chemist Dr. Paul Rosten, and Mayer invites him to join the research. When Thomas gets close to Mayer, the alien also possesses his mind in order to destroy the device and his notes. Meanwhile, Thomas is not able to control his murderous impulses and attacks several women with a straight razor.
When was Alien Terror released?
Alien Terror was released on April 1, 1971. It has a runtime of 1h 30m. The film was produced by Azteca Films.
Who stars in Alien Terror?
Alien Terror stars Boris Karloff, Enrique Guzmán, Christa Linder and Maura Monti. The full cast list is available in the Cast section above.
Is Alien Terror available in HD?
Yes, Alien Terror is available to stream in high definition (HD) on CineFlixo. Our players automatically deliver the best quality your connection supports — no extra setup needed.