In a secret government lab, Dr. Alan Woodman conducts experiments to develop a violent alien into a revolutionary fighting machine. The trial fails and the creature escapes into compound, killing everyone in its path. Only Woodman and his assistant Charlie survive. After locking down the facility, they send out a distress call and the top covert military force responds. Led by the beautiful but tough Rita Talon, the team has been instructed to locate and destroy the creature. Working with Woodman and Charlie, they begin the hunt but quickly realize that they have to deal with more than just the creature. 　　伍德曼博士获了古代陨石碎片，并发现上面记载有优秀物种的基因，他和上校安兹罗尔密谋复活这种强大物种，并作为战争机器。制造过程已经完成，上校为灭口派杀手去实验基地杀死那里所有工作人员，却发现异形已经被放出，他们如何逃离该基地呢？