If successful the aliens will score 50 points, and an extra 5 points per day which is eventually subtracted from your score. Alien Bases add significantly to the Alien score when they are constructed and between that and the much higher UFO activity present will have neighbouring countries in particular very agitated, possibly leading to them reducing or withdrawing funding. As such Alien Bases in key areas will need to be dealt with somehow, while Bases in remote locations might well not be so critical to target for action immediately.
|X-COM: Enemy Unknown/UFO Defense|
|Alien Missions:||Alien Origins • The Martian Solution • Cydonia or Bust • Alien Research • Alien Harvest|
|Alien Abduction • Alien Infiltration • Alien Base • Alien Terror • Alien Retaliation • Alien Supply|