Alien Appearance Ratios

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December (1998) - January
Mission/Race Sectoid Snakeman Ethereal Muton Floater
Alien Research 70% 10% - - 20%
Alien Harvest 50% 20% - - 30%
Alien Abduction 60% - - - 40%
Alien Infiltration 60% 20% - - 20%
Alien Base 30% 20% - - 50%
Alien Terror 30% - - - 70%
Alien Retaliation 60% 20% - - 20%


February - March
Mission/Race Sectoid Snakeman Ethereal Muton Floater
Alien Research 60% 10% - - 30%
Alien Harvest 50% - - - 50%
Alien Abduction 40% - - - 60%
Alien Infiltration 50% 20% - - 30%
Alien Base 40% 20% - - 40%
Alien Terror 60% - - - 40%
Alien Retaliation 30% 30% - - 40%


April - May
Mission/Race Sectoid Snakeman Ethereal Muton Floater
Alien Research 30% 10% - 30% 30%
Alien Harvest 30% - - 30% 40%
Alien Abduction 50% - - - 50%
Alien Infiltration 20% 20% - 50% 10%
Alien Base 10% 40% - 30% 20%
Alien Terror 20% 60% - - 20%
Alien Retaliation 20% 20% - 40% 20%


June - July
Mission/Race Sectoid Snakeman Ethereal Muton Floater
Alien Research 20% 10% - 40% 30%
Alien Harvest 10% - - 40% 50%
Alien Abduction 30% - - - 70%
Alien Infiltration 10% 10% 40% 30% 10%
Alien Base 10% 40% 10% 20% 20%
Alien Terror 10% 20% 40% 20% 10%
Alien Retaliation 20% 20% 20% 20% 20%


August and Beyond
Mission/Race Sectoid Snakeman Ethereal Muton Floater
Alien Research 30% 10% - 30% 30%
Alien Harvest 30% - - 30% 40%
Alien Abduction 50% - - - 50%
Alien Infiltration 20% 20% 10% 40% 10%
Alien Base 10% 20% 40% 20% 10%
Alien Terror 20% 30% 20% 20% 10%
Alien Retaliation 10% 10% 40% 20% 20%


Notes

  • The first appearance rate block includes December 1998; however, the game starts in January 1999. It is included because the tables cover 2 month blocks.
  • All rows except Alien Terror are unused in the January table; the non-Terror mission for January 1999 is hardcoded to be a Sectoid Alien Research mission in the same zone as X-Com's first base.
  • All Retaliation rows are unused. Retaliation missions are generated in response to shooting down enemy craft, with a set probability that is scaled by the difficulty level multiplier.
  • All months beyond August 1999 use the August table.
  • All values listed above are interpreted from probability tables in GEOSCAPE.EXE.
  • Alien bases will appear upon completion of Alien Base and Alien Infiltration missions. Interfering with the mission will delay the base's appearance, but cannot prevent it. They will be crewed by the same race that performed the Alien Base or Alien Infiltration mission.
  • Alien Supply missions will always be crewed by the same race as the base itself.
  • The Cydonia mission has a pre-defined crew setup.

See also

UFO BadgeX-COM: Enemy Unknown/UFO Defense
X-COM SoldiersHeavy Weapons Platforms
Aliens: FloaterSectoidSnakemanEtherealMuton

Terror Units: ReaperCyberdiscChryssalidZombieSectopodCelatidSilacoid

Stats Time UnitsEnergy (Stamina)HealthBraveryReactionsFiring AccuracyThrowing AccuracyStrengthPsionic StrengthPsionic SkillMelee AccuracyStunMoraleRankFatal Wounds
Data Alien StatsDamage ModifiersAlien Appearance RatiosAlien Weapon Loadouts
UFO Badge X-COM: Enemy Unknown/UFO Defense
Alien Missions:Alien OriginsThe Martian SolutionCydonia or BustAlien ResearchAlien Harvest
Alien AbductionAlien InfiltrationAlien BaseAlien TerrorAlien RetaliationAlien Supply