Horizon: Season 21 (1984)

This season started on January 9, 1984. The table lists episodes with recorded air dates up to September 28, 2026.

Ep	Title and air date	My place
1	The Intelligence ManJanuary 9, 1984 · 60 min
2	Microworld!January 16, 1984 · 60 min
3	A New Green Revolution?January 23, 1984 · 60 min
4	Spies in the WiresJanuary 30, 1984 · 60 min
5	Valley of the IncaFebruary 13, 1984 · 60 min
6	The Conquest of ParasitesFebruary 27, 1984 · 60 min
7	Reflections on a RiverMarch 5, 1984 · 60 min
8	A Normal FaceMarch 12, 1984 · 60 min
9	Prisoners of IncestMarch 19, 1984 · 60 min
10	Signs of the Apes, Songs of the WhalesMarch 26, 1984 · 60 min
11	Professor Bonner and the Slime MouldsApril 9, 1984 · 60 min
12	The Mind of a Murderer: The Case of the Hillside StranglerApril 16, 1984 · 60 min
13	The Mind of a Murderer: The Mask of MadnessApril 23, 1984 · 60 min
14	A Cruel InheritanceApril 30, 1984 · 60 min
15	The Malvern LinkMay 7, 1984 · 60 min
16	Contented Cows and Other AnimalsNovember 5, 1984 · 60 min
17	Picking WinnersNovember 12, 1984 · 60 min
18	The Brain PuzzleNovember 19, 1984 · 60 min
19	Global VillageNovember 26, 1984 · 60 min
20	IvanDecember 3, 1984 · 60 min
21	A Mathematical Mystery TourDecember 10, 1984 · 60 min
22	SuperchargedDecember 17, 1984 · 60 min