Quatermass (also known as The Quatermass Conclusion or Quatermass IV) is a British television science fiction serial produced by Euston Films for Thames Television and broadcast on the ITV network in October and November 1979. Like its three predecessors, Quatermass was written by Nigel Kneale. 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.