威廉姆一家离群索居，住在南加州沙漠的腹地，除了他们的房子外，四周一片荒凉。老威廉姆（Jim Davis 吉姆戴维斯 饰）的孙女在房子的后面发现一个奇怪的白色物体，周身闪着绿色光芒。她坚信这是外星人，并叫来爷爷和母亲观看，然而他们却什么也没看到。爷爷离去后，小女孩再次看到这个“怪物”，这次它变得更小。女孩将其放入口袋，带进卧室。
深夜，“怪物”幻化成绿色的小人，与小女孩开起了玩笑。但另一群外星人不期而至，将威廉姆家的房子带入时空隧道，送到了恐龙横行的史前世界……
A man wrongly imprisoned for murder breaks out of jail. He wants to clear his name, but with the police pursuing him, he's forced to take a beautiful young woman, driving a fast sports car, hostage and slip into a cross-border sports car race to try to make it to Mexico before the police get him.
