一颗陨石坠落到亚利桑那州的荒漠中,在它撞击形成的溶洞内,一个与世隔绝的奇异世界正飞速形成。从单细胞到多细胞,从类鸟类到灵长类,外星生物已难以想象的速度高速进化,并开始影响人类的生存。 在大学任教的伊尔(David Duchovny 大卫•杜楚尼 饰)和同事兼好友哈里(Orlando Jones 奥兰多•琼斯 饰)最早发现了陨石所带来的外星生物痕迹,并意识到其高速进化背后的危险性。在隶属军方疾病控制中心的女官员艾丽森(Julianne Moore 朱丽安•摩尔 饰)的帮助下,他们偷偷搜集数据,寻找遏制外星生物入侵的办法……When a meteorite falls to Earth two college professors, Dr. Ira Kane and Prof. Harry Phineas Block, are assigned the job of checking the site out. At the site, they discover organisms not of this planet. Soon the site is taken over by the government, forcing Ira and Harry to the side. As the new life-forms begin to evolve and start to get more and more dangerous, it's up to the two professors to save the planet.