At this stage Kneale was working primarily at ITV, having written the play "Murrain" (screened in the anthology series "Against The Crowd", 1975) and the anthology series "Beasts" (1976) for ATV. In May 1977, Euston Films—a subsidiary of Thames Television best known for "The Sweeney" (1975–1978)—announced that it had picked up Kneale's unmade "Quatermass" scripts. This new production, known either as "Quatermass" or "Quatermass IV", would consist of a four-part serial to be broadcast by ITV which would be recut as a 100-minute film, titled "The Quatermass Conclusion", for release in North America and Europe. Kneale was dubious about having to craft both a television serial version and a film version of his tale, feeling that "in the end we had two versions, neither of which was the right length for the story". During the rewrites, Kneale transplanted the action at the conclusion of part three from Stonehenge to the more easily available Wembley Stadium. When asked about what differences there were between the Euston Films version and the version originally envisaged for the BBC, Kneale remarked that "the BBC version would have been much more in the studio, whereas the Euston Films version was entirely shot on 35mm film with a great deal of it outside. Much more lavish than either the BBC or I had contemplated".