Most of Alien Invasion's content centered around player organizations. "City plots" were placed throughout Rubi-Ka which organizations can buy to erect custom cities. These cities give skill bonuses, access to unique equipment, access to new dynamic missions, and venues for role-play events. It also included a new starter area - which serves as a training ground for new characters - and new user interface. The perk system was extended with the introduction of "alien experience points".