The main character is Dr. Max Holst, a successful neurosurgeon. One day an intense little man named Steinmetz shows up, who has the real ability to create objects out of thin air, using only his mind. As no one believes him at first, he is held at a ward for mental patients, but manifests the key to his door and escapes. As he has a special interest in Dr. Holst, Steinmetz subsequently invites Holst to his large mansion, which is full of expensive paintings and sculptures, and proves to him that he can in fact materialise objects. Steinmetz’s abilities are evolving by leaps and bounds, and is progressing from being able to create objects only to being able to create living things. His ultimate ambition is to be able to create a human being. He tells Dr. Holst that if he will only perform a certain brain operation on him, Steinmetz will become able to attain his goal. He’s got all the necessary equipment set up in his basement. Dr. Holst, however, is too spooked by the whole thing to agree to this mad scheme, and refuses. Steinmetz then sets about manipulating Holst’s life, to pressure him into performing the operation. By then Steinmetz has become able to create a temporary human being, and in the hope that he can perhaps make his own creation perform the operation, he manifests a doppelganger of Dr. Holst. This double proceeds to take over Dr. Holst’s life, creating chaos for him professionally and personally. And then Dr. Holst starts fighting back. The ending has the dual virtue of being both unexpected and satisfying.

　　阿克曼博士是當地一所大學的生物老師，他在被不明飛行物追趕時遇到了意外的死亡。韋斯利，他的一個學生，在吸引女性方面有困難。這一切都發生了變化，當Xenobia女士接管了阿克曼的課程，并說服衛斯理參加一些維生素研究，她和她的助理Drax正在進行。突然，韋斯利變得很有魅力，盡管在興奮的時候，他的腦袋里長出了肉質的天線。他新發現的成功可能會疏遠他真正關心的那個女孩(Leeanne)，而Xenobia的動機可能與她不是這個地球的事實有關。

　　約翰．卡彭特導演的這部科幻片并沒有強調特技噱頭，反而將重心放在異鄉人的主題上，而且拍出了相當浪漫動人的氣氛，甚至可以將它當作一部取外星人為主角的文藝片來欣賞。杰夫．布里奇斯飾演一名純真的外星人，他的宇宙飛船被地救人擊落，掉在威斯康辛州的荒野。他負傷來到新近喪偶的寡婦凱倫艾的家中，并且借用她丈夫的身體來延續生命。在學習地球人的生活方式過程中，他跟寡婦發生了感情。外星人的救援隊將在三天后到達亞歷桑納州接他回外層空間，他需要寡婦開車送他到那里。地球上的兩位政府官員也接獲訊息，他們決定不管生死都要捉住外星人，因而引發了一場精彩的拉鋸戰。

　　白天，他們是隱形的——豪華酒店的服務員、女招待和調酒師。到了晚上，他們就是劫車者，一群熟練的司機，在路上追蹤和搶劫富有的客戶。當他們計劃最終的搶劫時，酒店經理雇傭了一名無情的殺手，不惜一切代價阻止他們。隨著危險的臨近，諾拉、佐伊、史蒂夫和普雷斯頓能取得迄今為止最大的成績嗎？