2K and Firaxis have released the new trailer for XCOM: Enemy Within in this "Official 'Security Breach Trailer."

A rogue organization, known as EXALT, is threatening to undermine XCOM operations by acquiring alien technology for their own use. You will need to send in covert operatives to track down the source of this new threat and eliminate it.

Enemy Within is an expansion to XCOM: Enemy Unknown. It is slated for release on November 12 for the PC, 360, and PS3.