 In 1966 Kneale worked again for Hammer Film Productions when he adapted Norah Lofts 's 1960 novel The Devil 's Own into the horror film The Witches . Kneale had first worked on the screenplay for the adaptation in 1961 , the same year in which he had begun to adapt Quatermass and the Pit for Hammer . Like The Witches , the film version of Quatermass and the Pit took several years to reach the screen , eventually being released in 1967 . Roy Ward Baker directed , with Andrew Keir starring as Quatermass . Kneale was much happier with this version than the previous Hammer Quatermass adaptations , and the film was described by The Independent in 2006 as " one of the best ever Hammer productions . " Quatermass and the Pit was Kneale 's final credited film work ; 1979 's The Quatermass Conclusion was only released to cinemas in overseas markets after having been made for television in the UK , and he had his name removed from the credits of Halloween III : Season of the Witch ( 1982 ) . 
