It is the fourth and final television serial to feature the character of Professor Bernard Quatermass. In this version, the character is played by John Mills. Influenced by the social and geopolitical situation of the early 1970s and the hippie youth movement of the late 1960s, Quatermass is set in a near future in which large numbers of young people are joining a cult, the "Planet People", and gathering at prehistoric sites, believing they will be transported to a better life on another planet.





Chapter One: Ringstone Round





Quatermass (John Mills), now living in retirement in Scotland, travels to London in search of his granddaughter, Hettie Carlson (Rebecca Saire), who has gone missing. He is shocked by the scale of the urban collapse that has struck the city – law and order has broken down and marauding gangs terrorise the litter strewn, decaying streets. Appearing as a guest on a television programme covering the "Hands in Space" project, a joint space mission between the United States and Russia, Quatermass is horrified when the two spacecraft are destroyed by some unknown force. Astronomer Joe Kapp (Simon MacCorkindale), another guest on the programme, invites Quatermass to join him at his home in the country where he has constructed a radio telescope. At the radio telescope, Kapp's colleagues report that they detected a powerful signal at the exact time of the incident in space. Quatermass is intrigued by the behaviour of a group of hippie-like youngsters known as the Planet People, who are travelling to various Neolithic sites from where they believe they will be transported to a better life on another planet. Quatermass suspects Hettie has joined them. Along with Kapp's wife, Claire (Barbara Kellerman), Quatermass and Kapp follow a group of Planet People to a stone circle of megaliths, Ringstone Round. As they watch, the Planet People assembled inside the circle are bathed in a bright light and disappear, leaving only a residue of white dust.





Chapter Two: Lovely Lightning





The Planet People's leader, Kickalong (Ralph Arliss), believes that the Planet People gathered at Ringstone Round have been transported, as promised, to the planet but it is clear to Quatermass and Kapp that they have been reduced to ashes. One survivor – a girl called Isabel (Annabelle Lanyon) who deliriously talks about "lovely lightning" – is found and is brought back to the Kapps' cottage. Making contact with NASA scientist Chuck Marshall (Tony Sibbald), they learn that thousands of young people have disappeared in similar incidents all around the world. Quatermass, aided by District Commissioner Annie Morgan (Margaret Tyzack), decides to bring Isabel to London for tests. As they make their journey, Quatermass speculates as to whether there is any connection between recent events and the decline in society. Reaching London, they are attacked by a gang. Quatermass is yanked from the car but Annie and Isabel manage to escape. Meanwhile, a large number of Planet People arrive at the radio telescope, congregating at the stone circle on its grounds. Working at a perimeter building, Kapp is horrified to see the light strike the area around his home – rushing home he finds his family gone.





Chapter Three: What Lies Beneath





Quatermass is rescued by a group of elderly people living in a scrap yard. At the hospital, the doctors are shocked when Isabel levitates off her bed and explodes in a cloud of dust. Elsewhere, the devastated Kapp is left alone in the ruins of his cottage and observatory. More and more young people are joining the Planet People, including the gangs that have been terrorising the cities and the soldiers assigned to keep them away from the Megalithic sites. Contact is restored with Chuck Marshall and with the Russians in the form of Gurov (Brewster Mason). Quatermass theorises that this is not the first time this has happened; Megalithic sites such as prehistoric stone circles are in fact markers where beacons have been left by the alien force for its next visit. Quatermass believes the force is a sphere of energy surrounding the Earth. The Russians and the Americans send a space shuttle, commanded by Marshall, to make contact with the force. Quatermass is sceptical; he believes they are dealing not with an intelligence but with a machine constructed to harvest human protein. The space shuttle is destroyed but not before Marshall reports a giant beam of light stretching in all directions. Meanwhile, the Planet People are gathering at Wembley Stadium in the tens of thousands. Annie and Quatermass travel to the stadium but are powerless to prevent the Planet People from gathering. When they are attacked, Annie drives their car into the underground car park beneath the stadium where she crashes the vehicle and is killed. The lightning strikes the stadium.





Chapter Four: An Endangered Species



