🎬 CineStream ▶ Watch Now
Unknown World poster

Watch Unknown World (1951) Online Free in HD

★ 4.4/10 1951 1h 14m AdventureScience Fiction

With the cyclotram, an atomic-powered rock-boring vehicle, Dr. Jerimiah Morley leads an expedition into a subterranean world.

▶ Watch Unknown World Now ▶ Watch Trailer

About Unknown World

With the cyclotram, an atomic-powered rock-boring vehicle, Dr. Jerimiah Morley leads an expedition into a subterranean world.

Movie details

Release date
1951-10-26
Runtime
1h 14m
Genres
Adventure, Science Fiction
Rating
4.4/10 (34 votes)
Language
EN
Country
United States of America
Director
Terry O. Morse
Writer
Millard Kaufman

Cast

Bruce Kellogg
Bruce Kellogg
Wright Thompson, Jr.
Otto Waldis
Otto Waldis
Dr. Max A. Bauer
Jim Bannon
Jim Bannon
Andrew "Andy" Ostergaard
Tom Handley
Tom Handley
Dr. James Paxton
Dick Cogan
Dick Cogan
Dr. George Coleman
George Baxter
George Baxter
Carlisle Foundation Chairman
Marilyn Nash
Marilyn Nash
Dr. Joan Lindsey
Victor Kilian
Victor Kilian
Dr. Jeremiah Morley (uncredited)

Watch the trailer

You may also like

Planet of Storms poster Planet of Storms (1962) Doctor Blood's Coffin poster Doctor Blood's Coffin (1961) The Strange World of Planet X poster The Strange World of Planet X (1958) T'Day poster T'Day (2025) Five Weeks in a Balloon poster Five Weeks in a Balloon (1962) Flight to Mars poster Flight to Mars (1951) The Revenge of Hercules poster The Revenge of Hercules (1960) Earth vs. the Spider poster Earth vs. the Spider (1958) Ali Baba and the Forty Thieves poster Ali Baba and the Forty Thieves (1954) Boys Go to Jupiter poster Boys Go to Jupiter (2025) Zontar: The Thing from Venus poster Zontar: The Thing from Venus (1967) Shortcut poster Shortcut (2020)

Frequently asked questions

Where can I watch Unknown World (1951) online?

Watch Unknown World (1951) on CineStream — full HD streaming with subtitles in 20+ languages, smart resume across devices. Total runtime 1h 14m. Start watching →

Is Unknown World free to watch on CineStream?

Yes — every new visitor gets a 5-minute free trial with no signup required. After the trial, link your Telegram account for 30 bonus minutes, then either pay-per-minute or grab an unlimited subscription via Telegram Stars.

What's the rating of Unknown World?

Unknown World (1951) has a rating of 4.4/10 based on 34 viewer votes on TMDB.

How long is Unknown World?

The runtime of Unknown World (1951) is 1h 14m.

Does Unknown World have subtitles?

CineStream auto-attaches subtitles in over 20 languages including English, Spanish, French, German, Hindi, Tamil, Sinhala, Arabic, and more. Pick your language from the player's CC menu.

Ready to watch Unknown World?

5-minute free trial • No signup required • HD with subtitles

▶ Start watching now