Thomas Jerome Newton is an alien who has come to Earth in search of water to save his home planet. Aided by lawyer Oliver Farnsworth, Thomas uses his knowledge of advanced technology to create profitable inventions. While developing a method to transport water, Thomas meets Mary-Lou, a quiet hotel clerk, and begins to fall in love with her. Just as he is ready to leave Earth, Thomas is intercepted by the U.S. government, and his entire plan is threatened.
Head of company security, Harry Webb, fears that a diamond theft is about to take place at their major mining complex deep in the desert. He quickly manages to become very unpopular, particularly with Claire Chambers, a celebrated cover girl, daughter of the mine administrator. She is visiting the man she loves, Mike Bradley, who is responsible for security at the mine. Nelson, the mine administrator, gives Bradley a curious mission - to steal a diamond. He wants to implicate Bradley in order to bring him into contact with a certain Lewis who is preparing to rob the mine with the aid of a group of mercanaries and a local accessory known as Father Christmas. Webb, not being informed of the deceit, relentlessly pursues Bradley, who is contacted by Lewis. With the mercanaries in the process of penetrating the mine. Bradley reveals himself to be Father Christmas, the organiser of the entire operation...
