Alien Appearance Ratios
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| 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.