Horizon: Season 21
EP1 - The Intelligence Man
EP2 - Microworld!
EP3 - A New Green Revolution?
EP4 - Spies in the Wires
EP5 - Valley of the Inca
EP6 - The Conquest of Parasites
EP7 - Reflections on a River
EP8 - A Normal Face
EP9 - Prisoners of Incest
EP10 - Signs of the Apes, Songs of the Whales
EP11 - Professor Bonner and the Slime Moulds
EP12 - The Mind of a Murderer: The Case of the Hillside Strangler
EP13 - The Mind of a Murderer: The Mask of Madness
EP14 - A Cruel Inheritance
EP15 - The Malvern Link
EP16 - Contented Cows and Other Animals
EP17 - Picking Winners
EP18 - The Brain Puzzle
EP19 - Global Village
EP20 - Ivan
EP21 - A Mathematical Mystery Tour
EP22 - Supercharged
Horizon
First Air Date: 1964-02-04
Original Language: EN
Vote Average: 7.4
TMDB-ID: 1966
IMDB ID: tt0318224
