Alien horror becomes a living nightmare as the Xenos, meaning "strangers", inflict mayhem on earth. International distress alerts are sent out when planes first seem to disappear, disturbing concepts of space and time and leaving a trail of death and disillusionment. This bizarre series of "cosmic skyjackings" is shrouded in secrecy by a baffled and frightened military. Intense surveillance fails to reveal the cause of a seemingly hostile yet invisible enemy. Aircraft continue to disappear, plucked out of the sky without warning, only to reappear months later, thousands of miles off course. National and global security is under threat and the ICARUS committee is formed to investigate. Military officials, the government and the FBI work alongside physician Mark Freedman and Soviet scientists to uncover the supernatural mystery that lies behind these unexplainable events. Earth has been found by a horde of creatures that not even the wildest imagination could invent - sinister parasitic creatures that took to their human hosts with deadly speed and bloodthirsty precision. The terror that unfolds has terrifying consequences for all involved, and the invasion reveals something much more frightening and final than ever suspected.