Sezon 12
Bölümler
1 The Killer Dust 20 Oca 1975 
2 A Time to Be Born 27 Oca 1975 3 The Unsafe Sea 10 Şub 1975 4 The Change of Life 17 Şub 1975 5 Project Fido 24 Şub 1975 6 The Planets 10 Mar 1975 7 The Long, Long Walkabout 7 Nis 1975 8 The Overworked Miracle 14 Nis 1975 9 Not the Cheapest, But the Best 21 Nis 1975 10 A Spoonful of Roughage 28 Nis 1975 11 Brain Poison 5 May 1975 12 The Bulldog's Last Bark? 12 May 1975 13 Benjamin 19 May 1975 14 The McMaster Experiment 2 Haz 1975 15 The Glazed Outlook 9 Haz 1975 16 The Three Chord Trick 16 Haz 1975 17 The Cleanest Place in the World 23 Haz 1975 18 Strange Sleep 30 Haz 1975 19 The Greatest Advance Since the Wheel? 7 Tem 1975 20 How Do You Read? 14 Tem 1975 21 The Sickly Sea 21 Tem 1975 22 Happy Catastrophe 28 Tem 1975 23 To Die, to Live - The Survivors of Hiroshima 4 Ağu 1975 24 Cannabis 11 Ağu 1975 25 Meditation and the Mind 18 Ağu 1975 26 The Trobriand Experiment 29 Ara 1975
2 A Time to Be Born 27 Oca 1975 3 The Unsafe Sea 10 Şub 1975 4 The Change of Life 17 Şub 1975 5 Project Fido 24 Şub 1975 6 The Planets 10 Mar 1975 7 The Long, Long Walkabout 7 Nis 1975 8 The Overworked Miracle 14 Nis 1975 9 Not the Cheapest, But the Best 21 Nis 1975 10 A Spoonful of Roughage 28 Nis 1975 11 Brain Poison 5 May 1975 12 The Bulldog's Last Bark? 12 May 1975 13 Benjamin 19 May 1975 14 The McMaster Experiment 2 Haz 1975 15 The Glazed Outlook 9 Haz 1975 16 The Three Chord Trick 16 Haz 1975 17 The Cleanest Place in the World 23 Haz 1975 18 Strange Sleep 30 Haz 1975 19 The Greatest Advance Since the Wheel? 7 Tem 1975 20 How Do You Read? 14 Tem 1975 21 The Sickly Sea 21 Tem 1975 22 Happy Catastrophe 28 Tem 1975 23 To Die, to Live - The Survivors of Hiroshima 4 Ağu 1975 24 Cannabis 11 Ağu 1975 25 Meditation and the Mind 18 Ağu 1975 26 The Trobriand Experiment 29 Ara 1975