Zane (Charlie Sheen) is shy and unsociable. He is an enthusiast of outer space civilization who devotes himself to his career. By chance, Zane received a mysterious signal. Based on years of research experience, Zane immediately discovered that the sender of this signal was an alien. Excited Zane reported the collected intelligence to his boss, but his boss did not believe Zane, who seemed crazy on weekdays. In desperation, Zane decided to investigate on his own. Following the signal wave, Zane came to the suburbs of Mexico, where he met a female scientist named Elena (Lindsay Crouse). The two worked together and soon discovered an amazing news-the signal was not emitted from an alien star, but from the interior of the earth, that is, on the earth, there are aliens disguised as humans. They have only one purpose, which is to destroy humans by changing the climate.