The Moon Stallion is a British children's television serial made by the BBC in 1978 and written by Brian Hayles, who also authored its novelisation.
[1][2][3] The series stars Sarah Sutton as Diana Purwell, a young blind girl who becomes embroiled in mystical intrigue set around the Berkshire and Wiltshire countryside.
Set in the late Victorian era, the story tells of how the Purwell family travel to Wiltshire when the widowed father is contacted by Sir George Mortenhurze, local squire and a former cavalry officer, to seek out historical evidence of King Arthur.
On the way they briefly encounter the Moon Stallion, a white horse living wild on the downs, whom Diana is aware of despite her being blind.
[2] Diana and Paul, with Estelle the daughter of Sir George, discover that Mortenhurze and Todman seek to capture the horse.