All Episode in 1974

1. A Matter of Self-Defense 2. Bird Brain - The Mystery of Bird Navigation 3. Never Too Late to Learn 4. The Great Fish Hunt 5. Pedal Power 6. The Writing on the Wall 7. Where Did the Colorado Go? 8. The Future Goes Boom 9. Fusion: The Energy Promise 10. The First Ten Years 11. This Yankee Dodge Beats Mesmerism Hollow 12. The Hunting of the Quark 13. A Noah's Ark for Europe 14. Bridges: When It Comes to the Crunch 15. Search for Life 16. The Secrets of Sleep 17. Who Needs Skills? 18. Hills of Promise 19. The Race for the Double Helix 20. The Immigrant Doctors 21. Mines, Minerals and Men 22. What Price Steak? 23. Listen and Be Loyal 24. Adam or Eve? 25. An Unholy Scramble 26. Do as You Are Told 27. The First Signs of Washoe 28. The Other Way 29. The Greatest Advance Since the Wheel? 30. Joey 31. The Neglected Harvest 32. How on Earth Did They Do That? 33. The Lysenko Affair

Season List

Horizon Specials Horizon 1964 Horizon 1965 Horizon 1966 Horizon 1967 Horizon 1968 Horizon 1969 Horizon 1970 Horizon 1971 Horizon 1972 Horizon 1973 Horizon 1974 Horizon 1975 Horizon 1976 Horizon 1977 Horizon 1978 Horizon 1979 Horizon 1980 Horizon 1981 Horizon 1982 Horizon 1983 Horizon 1984 Horizon 1985 Horizon 1986 Horizon 1987 Horizon 1988 Horizon 1989 Horizon 1990 Horizon 1991 Horizon 1992 Horizon 1993 Horizon 1994 Horizon 1995 Horizon 1996 Horizon 1997 Horizon 1998 Horizon 1999 Horizon 2000 Horizon 2001 Horizon 2002 Horizon 2003 Horizon 2004 Horizon 2005 Horizon 2006 Horizon 2007 Horizon 2008 Horizon 2009 Horizon 2009-2010 Horizon 2010-2011 Horizon 2011-2012 Horizon 2012-2013 Horizon 2013-2014 Horizon 2014-2015 Horizon 2016 Horizon 2017 Horizon 2018 Horizon 2019 Horizon 2020 Horizon 2021 Horizon 2022 Horizon 2024