Skip to content

123MVIESWatch Your Favorite Movies Online

Home
Genres
Country
Movies
TV-Series
Top IMDb

Search movies or series

123movies

Movies
TV-Series
FAQ's
DMCA

Genres

Comedy
Drama
Action
Thriller
Western

Country

United States
Kazakhstan
Canada
Ireland
Iran

Subscribe

Subscribe to the 123Movies mailing list to receive updates on movies, tv-series and news of top movies.

Email address

123MVIESWatch Your Favorite Movies Online

123Movies - Watch Movies Online For Free and Download the latest movies without Registration.

Disclaimer: This site does not store any files on its server. All contents are provided by non-affiliated third parties.

This product uses the TMDB API but is not endorsed or certified by TMDB.

Copyright © 2026 123Movies. All Rights Reserved

TV-Series HorizonS21 · E18

S21 · E18

Watch Next Episode in HD

Like and Share our website to support us.

Ads can be a pain, but they are our only way to maintain the server. Your patience is highly appreciated and we hope our service can be worth it.

S21 · E18

The Brain Puzzle

Nov 19, 19841h

Horizon documents the current medical research into finding new ways of repairing damage to the brain and the central nervous system.

‹ E17 All episodes E19 ›

Episodes

S01 S02 S03 S04 S05 S06 S07 S08 S09 S10 S11 S12 S13 S14 S15 S16

S21 · E01
The Intelligence Man
Jan 9, 1984 · 1h
S21 · E02
Microworld!
Jan 16, 1984 · 1h
S21 · E03
A New Green Revolution?
Jan 23, 1984 · 1h
S21 · E04
Spies in the Wires
Jan 30, 1984 · 1h
S21 · E05
Valley of the Inca
Feb 13, 1984 · 1h
S21 · E06
The Conquest of Parasites
Feb 27, 1984 · 1h
S21 · E07
Reflections on a River
Mar 5, 1984 · 1h
S21 · E08
A Normal Face
Mar 12, 1984 · 1h
S21 · E09
Prisoners of Incest
Mar 19, 1984 · 1h
S21 · E10
Signs of the Apes, Songs of the Whales
Mar 26, 1984 · 1h
S21 · E11
Professor Bonner and the Slime Moulds
Apr 9, 1984 · 1h
S21 · E12
The Mind of a Murderer: The Case of the Hillside Strangler
Apr 16, 1984 · 1h
S21 · E13
The Mind of a Murderer: The Mask of Madness
Apr 23, 1984 · 1h
S21 · E14
A Cruel Inheritance
Apr 30, 1984 · 1h
S21 · E15
The Malvern Link
May 7, 1984 · 1h
S21 · E16
Contented Cows and Other Animals
Nov 5, 1984 · 1h
S21 · E17
Picking Winners
Nov 12, 1984 · 1h
S21 · E18
The Brain Puzzle
Nov 19, 1984 · 1h
S21 · E19
Global Village
Nov 26, 1984 · 1h
S21 · E20
Ivan
Dec 3, 1984 · 1h
S21 · E21
A Mathematical Mystery Tour
Dec 10, 1984 · 1h
S21 · E22
Supercharged
Dec 17, 1984 · 1h

Horizon S21E18 - The Brain Puzzle | 123Movies