Alien Appearance Ratios

January - February
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%

March - April
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%

May - June
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%

July - August
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%

September 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

• All months beyond September 1999 use the September table.

• All values listed above are interpreted off probability tables obtained directly from GEOSCAPE.EXE.

• The crew of already established Alien Bases, ships on Alien Supply missions, and Terror Sites will be crewed by the same crew that founded the base or terror site.

• The Cydonia mission has a pre-defined crew setup.