XCOM: Enemy Within -- Official Announcement Trailer

As a substantial expansion to the turn-based tactical strategy game *XCOM: Enemy Unknown*, *Enemy Within* deepens the core experience by introducing the alien resource, Meld. Players collect Meld during missions to unlock two major enhancements: powerful robotic MEC Troopers or permanent genetic modifications (Gene Mods) for human soldiers. This content integrates into the main campaign (requiring the base game on PC/Mac, but standalone on consoles) and adds new maps, enemies, and multiplayer options, significantly expanding strategic and tactical depth.