Alien Missions in Enemy Unknown (OpenXcom)

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UFOs are sent out periodically to conduct a number of types of Alien Missions, some of which the purpose is fairly inscrutable, others are fairly obvious in their reasoning. Especially once the Hyper-wave Decoder is deployed, knowing the mission of the aliens can help make strategic plans for further actions that the aliens may attempt in the near future.

List of Alien Missions

Alien Missions Frequency

The aliens will generate new missions each month according to the following pattern:

  • January, 1999: 1 Alien Research, 1 Alien Terror, shooting down UFOs may trigger an Alien Retaliation mission.
  • February to May, 1999: 1 random mission, 1 Alien Terror, shooting down UFOs may trigger an Alien Retaliation mission.
  • June, 1999: 2 random missions, 1 Alien Terror, shooting down UFOs may trigger an Alien Retaliation mission.
  • After The Martian Solution is researched OR depending the difficulty level (March 2000 on Easy or November 1999 on Superhuman): 1 Alien Retaliation mission is added, in addition to the above.

Alien Missions Selection

The game will create an array of possible missions for each region of the world to be used when randomly selecting missions for each month. Once a particular mission is selected it will be removed from the array and won't appear again. If all of the missions are used then the game will restart this process and refill the mission array. Alien Terror, Retaliation and Supply missions are special cases and are not present in this array since those missions are automatically generated.

First the game will randomly choose a region for the mission, using weighted factors to influence the probability of each region being selected:

  • North America: 18
  • Arctic: 4
  • Antarctic: 4
  • South America: 10
  • Europe: 16
  • North Africa: 12
  • South Africa: 8
  • Central Asia: 12
  • Southeast Asia: 15
  • Siberia: 10
  • Australia: 10
  • Pacific: 5


See Also


UFO Badge 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
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