简介：<p>　　蕾普莉（西格妮•韦弗 Sigourney Weaver　饰）是首次探险任务遇到异形后的唯一生还者，她一直冬眠直到被救援队救回地球。当她睁开眼睛后，才发现自己已经冬眠了57年！ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　期间，人类已经移居到了异形所在的星球。蕾普莉知道后，马上向当局报局该星球上异形的情况，但却被当局认为要么精神不正常，要么谎话连篇。蕾普莉见当局对她的说话不予理睬，便决心不再涉足和异形有关的</p>…