Season 1
- 1Into the Circle10 Jan 1977
- 2Circle of Fear17 Jan 1977
- 3Serpent in the Circle24 Jan 1977
- 4Narrowing Circle31 Jan 1977
- 5Charmed Circle7 Feb 1977
- 6Squaring the Circle14 Feb 1977
- 7Full Circle21 Feb 1977
A scientist and his son travel to a quiet village to study the 4000 year old stone circle surrounding it, but they uncover a secret society led by the village squire, who are attempting to release and control an ancient power contained within the stones.