James Lurie

Narrator (voice)

Seth Shostak

Self - SETI Institute

Nick Pope

Self - U.K. Ministry of Defense

Brian De Toy

Self - Director of Defense Studies, West Point

Stephen Hawking

Self - Theoretical Physicist (archive footage)

Paul Springer

Self - USAF Air Command and Staff College

Travis Taylor

Self - Physicist & Author

Bob Boan

Self - Co-Author, Alien Invasion: How to Defend Earth

Michael Michaud

Self - Author, Contact with Alien Civilizations

Paul Parsons

Self

John Ringo

Self - Author, Live Free or Die

Mark Moffett

Self - Author: Adventures Among Ants

Dirk Schulze-Makuch

Self - Washington State University

Neil Strauss

Self - Author, Emergency

Kevin Reeve

Self - onPoint Tactical

Quay Terry

Self - Gunnery Sergeant, USMC

Bill Brown

Self - High Altitude Research Corp.

Elise Cantu

Survivor

Carin Chea

Laboratory Scientist

Zee Cruise

Survivor

Leandro DiMonriva

Scientist

Kenneth Favell

Survivor

Philip Hersh

News Correspondent

Sydney Jay

Survivor

Christopher Clay Jones

Resistance Leader

Matt Lasky

Survival Expert

Eric Raymond Lim

Resistance Fighter

Desiree Martin

Survivor

Tiffany Martinez

Survivor

Richard Miraan

Astronomer

Jose Rosete

Survivor

David Schlachtenhaufen

Resistance Fighter

Christopher Warren

Agent Patterson

Avihai Yaffe

Survivor

Justin Cuomo

Human Resistance Leader