Alien Appearance Ratios
| January - February | |||||
|---|---|---|---|---|---|
| Mission/Race | Sectoid | Snakeman | Ethereal | Muton | Floater |
| Alien Research | 70 | 10 | - | - | 20 |
| Alien Harvest | Sectoid | Snakeman | Ethereal | Muton | Floater |
| Alien Abduction | Sectoid | Snakeman | Ethereal | Muton | Floater |
| Alien Infiltration | Sectoid | Snakeman | Ethereal | Muton | Floater |
| Alien Base | Sectoid | Snakeman | Ethereal | Muton | Floater |
| Alien Terror | Sectoid | Snakeman | Ethereal | Muton | Floater |
| Alien Retaliation | Sectoid | Snakeman | Ethereal | Muton | Floater |
Research 70 10 0 0 20 Harvest 50 20 0 0 30 Abduction 60 0 0 0 40 Infiltration 60 20 0 0 20 Base 30 20 0 0 50 Terror 30 0 0 0 70 Retaliation 60 20 0 0 20
| March - April | |||||
|---|---|---|---|---|---|
| Mission/Race | Sectoid | Snakeman | Ethereal | Muton | Floater |
| Alien Research | Sectoid | Snakeman | Ethereal | Muton | |
| Alien Harvest | Sectoid | Snakeman | Ethereal | Muton | Floater |
| Alien Abduction | Sectoid | Snakeman | Ethereal | Muton | Floater |
| Alien Infiltration | Sectoid | Snakeman | Ethereal | Muton | Floater |
| Alien Base | Sectoid | Snakeman | Ethereal | Muton | Floater |
| Alien Terror | Sectoid | Snakeman | Ethereal | Muton | Floater |
| Alien Retaliation | Sectoid | Snakeman | Ethereal | Muton | Floater |
2 - 3
Sectoid Snakemen Ethereals Muton Floater Research 60 10 0 0 30 Harvest 50 0 0 0 50 Abduction 40 0 0 0 60 Infiltration 50 20 0 0 30 Base 40 20 0 0 40 Terror 60 0 0 0 40 Retaliation 30 30 0 0 40
| May - June | |||||
|---|---|---|---|---|---|
| Mission/Race | Sectoid | Snakeman | Ethereal | Muton | Floater |
| Alien Research | Sectoid | Snakeman | Ethereal | Muton | |
| Alien Harvest | Sectoid | Snakeman | Ethereal | Muton | Floater |
| Alien Abduction | Sectoid | Snakeman | Ethereal | Muton | Floater |
| Alien Infiltration | Sectoid | Snakeman | Ethereal | Muton | Floater |
| Alien Base | Sectoid | Snakeman | Ethereal | Muton | Floater |
| Alien Terror | Sectoid | Snakeman | Ethereal | Muton | Floater |
| Alien Retaliation | Sectoid | Snakeman | Ethereal | Muton | Floater |
4 - 5
Sectoid Snakemen Ethereals Muton Floater Research 30 10 0 30 30 Harvest 30 0 0 30 40 Abduction 50 0 0 0 50 Infiltration 20 20 0 50 10 Base 10 40 0 30 20 Terror 20 60 0 0 20 Retaliation 20 20 0 40 20
| July - August | |||||
|---|---|---|---|---|---|
| Mission/Race | Sectoid | Snakeman | Ethereal | Muton | Floater |
| Alien Research | Sectoid | Snakeman | Ethereal | Muton | |
| Alien Harvest | Sectoid | Snakeman | Ethereal | Muton | Floater |
| Alien Abduction | Sectoid | Snakeman | Ethereal | Muton | Floater |
| Alien Infiltration | Sectoid | Snakeman | Ethereal | Muton | Floater |
| Alien Base | Sectoid | Snakeman | Ethereal | Muton | Floater |
| Alien Terror | Sectoid | Snakeman | Ethereal | Muton | Floater |
| Alien Retaliation | Sectoid | Snakeman | Ethereal | Muton | Floater |
6 - 7
Sectoid Snakemen Ethereals Muton Floater Research 20 10 0 40 30 Harvest 10 0 0 40 50 Abduction 30 0 0 0 70 Infiltration 10 10 40 30 10 Base 10 40 10 20 20 Terror 10 20 40 20 10 Retaliation 20 20 20 20 20
| September and Beyond | |||||
|---|---|---|---|---|---|
| Mission/Race | Sectoid | Snakeman | Ethereal | Muton | Floater |
| Alien Research | Sectoid | Snakeman | Ethereal | Muton | |
| Alien Harvest | Sectoid | Snakeman | Ethereal | Muton | Floater |
| Alien Abduction | Sectoid | Snakeman | Ethereal | Muton | Floater |
| Alien Infiltration | Sectoid | Snakeman | Ethereal | Muton | Floater |
| Alien Base | Sectoid | Snakeman | Ethereal | Muton | Floater |
| Alien Terror | Sectoid | Snakeman | Ethereal | Muton | Floater |
| Alien Retaliation | Sectoid | Snakeman | Ethereal | Muton | Floater |
8 +
Sectoid Snakemen Ethereals Muton Floater Research 30 10 0 30 30 Harvest 30 0 0 30 40 Abduction 50 0 0 0 50 Infiltration 20 20 10 40 10 Base 10 20 40 20 10 Terror 20 30 20 20 10 Retaliation 10 10 40 20 20
Notes
- 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.