 By the early 1970s Kneale was once again regularly writing for the BBC , who announced plans to produce a fourth Quatermass serial in 1972 . This ultimately was not made by the BBC , but Kneale 's scripts were produced in 1979 as a four @-@ part serial for Thames Television , titled Quatermass . This time John Mills played Quatermass in an expensive and high @-@ profile production , which was screened on the ITV network . The production company Euston Films also released a 100 @-@ minute film version titled The Quatermass Conclusion or Quatermass IV , for distribution abroad . There was , however , little interest among film distributors , and it received only a limited theatrical release . 
