 The director assigned to the serial , which was eventually named The Quatermass Experiment , was Rudolph Cartier . A few months beforehand he had directed a play entitled It Is Midnight , Dr. Schweitzer for the BBC , and he offered the role of Quatermass to one of the stars of that play , André Morell . Morell considered the offer but declined the part , which Cartier then offered to another actor who had appeared in It Is Midnight , Dr. Schweitzer , Reginald Tate , who accepted . 
