- 1 Title Unknown - 02 January 1966
Horizon follows experiments on the eyes being undertaken at the Department of Psychology at the University of Chicago. The purpose of the experiments are to discover if our eyes can tell us things we might prefer to keep secret.
Air Date: 1966-01-02
- 2 Title Unknown - 16 January 1966
Horizon explores an American mental hospital, observing schizophrenic patients under treatment with remarkable new drugs.
Air Date: 1966-01-16
- 3 A Man of Two Visions
A profile of Dr. Albert Copley, the famous hematologist, who is also known as an accomplished artist under the name of Alcopley.
Air Date: 1966-01-30
- 4 Title Unknown - 13 February 1966
Horizon looks at the research of dolphins being conducted at a United States naval base in Port Magu, California. The research concentrates on the dolphin's abilities of navigation.
Air Date: 1966-02-13
- 5 Title Unknown - 27 February 1966
Arthur C. Clarke talks about the film of his best selling book "2001: A Space Odyssey". Horizon looks at some of the sets and models being used in the film.
Air Date: 1966-02-27
- 6 Title Unknown - 13 March 1966
Horizon looks at the life cycle during the development of a human embryo.
Air Date: 1966-03-13
- 7 Title Unknown - 27 March 1966
Horizon looks into inventors who struggle against exploding technology, the buying power of great industries and taxation problems to make their leaps into the unknown.
Air Date: 1966-03-27
- 8 Title Unknown - 10 April 1966
Horizon investigates the problems of preserving ancient buildings in Athens and Rome.
Air Date: 1966-04-10
- 9 Title Unknown - 24 April 1966
There is no information on this episode.
Air Date: 1966-04-24
- 10 Man in Space
Horizon travels to the spacecraft center in Houston, Texas to study astronauts in space and how they react to being in space and the stresses of launching and re-entry.
Air Date: 1966-05-08
- 11 Title Unknown - 22 May 1966
Horizon looks at the possibilities of landing a man on the planet Mars.
Air Date: 1966-05-22
- 12 Title Unknown - 05 June 1966
Gordon Taylor meets with Konrad Lorenz, the inventor of ethology, and interviews him about his work on animal instinct and his theories about human instinct.
Air Date: 1966-06-05
- 13 Title Unknown - 19 June 1966
Horizon explores substitute 'phantoms' which are used in radiation studies, manned spaceflight experiments and accident research that gives valuable information on the limits of tolerance on the human body.
Air Date: 1966-06-19
- 14 Title Unknown - 03 July 1966
Dr. John Gurdon talks about the action of the chromosomes puffing when they undergo intense genetic activity.
Air Date: 1966-07-03
- 15 The Lonely Children
Horizon investigates the research conducted in England and America on the problems associated with autistic children.
Air Date: 1966-07-17
- 16 Title Unknown - 31 July 1966
This episode of Horizon reports on the famous science fiction writer, H. G. Wells.
Air Date: 1966-07-31
- 17 Title Unknown - 11 September 1966
Horizon explores the ideas that science fiction has value to real scientific research.
Air Date: 1966-09-11
- 18 Title Unknown - 25 September 1966
Horizon reports on the the Massachusetts Institute of Technology.
Air Date: 1966-09-25
- 19 Ten Years in the Antarctic
Horizon looks at the scientific research being carried out in the Antarctic under the guidance the Scientific Committee for Antarctic Research (SCAR) which was formed in 1856.
Air Date: 1966-10-10
- 20 The Athlete
Horizon investigates the stresses on athletes.
Air Date: 1966-10-24
- 21 From Peenemünde to the Moon
Christopher Chataway presents a program on the development of the rocket, first as a weapon, and then for the American space program.
Air Date: 1966-11-07
- 22 Title Unknown - 21 November 1966
Doctors and psychologists talk about the problems inherent in the determination of sex.
Air Date: 1966-11-21
- 23 The Structure of Life
This program shows the work of Ernst Chain, one of the discoverers of antibiotics, now a Professor of Biochemistry at the Imperial College in London.
Air Date: 1966-12-05
- 24 Hand Me My Sword, Humphrey
A sequence of clips which shows an episode of the drama "A Hundred Years of Humphrey Hastings" which centers around a family in the 1880's in which the father has a great interest in natural philosophy and science.
Air Date: 1966-12-25