Reparto (15)
James LurieNarrator (voice)Elise CantuSurvivorSeth ShostakSelf - SETI Institute
Nick PopeSelf - U.K. Ministry of DefenseBrian De ToySelf - Director of Defense Studies, West Point
Stephen HawkingSelf - Theoretical Physicist (archive footage)Paul SpringerSelf - USAF Air Command and Staff CollegeTravis TaylorSelf - Physicist & AuthorBob BoanSelf - Co-Author, Alien Invasion: How to Defend EarthMichael MichaudSelf - Author, Contact with Alien CivilizationsJohn RingoSelf - Author, Live Free or DieMark MoffettSelf - Author: Adventures Among AntsDirk Schulze-MakuchSelf - Washington State University
Neil StraussSelf - Author, EmergencyJustin CuomoHuman Resistance Leader (uncredited)