艾莉·爱罗维（茱迪·福斯特饰）自幼就对无线电通讯情有独钟。长大后，她成为一名天文学家，其项目内容为接收外太空信号。她希望能借此找到宇宙其他文明的存在。天才的理想得到的却是投资者的冷眼相看，幸好有神秘人

A giant alien creature comes to Earth. The reasons for its arrival, however, remain unknown as mankind fails to make contact with the visitor.