When it hits
No set day. It isn't on the calendar: it comes when Wave 3 - Day 1 starts it.
Starts with Wave 3 - Day 1, ends with 
All Fallen Back.
The same on every run: 
Wage Slave, Warehouse Manager
What comes
2 waves, 90 zombies in all.
| Wave | When | Zombies | Which | Total HP (Standard) |
|---|---|---|---|---|
| Wave 1 | with the crisis | 40 | Office Worker Zombie×8Nurse Zombie×5Barefoot Zombie×5Worker Zombie×4Crawler Zombie×4Hulk Zombie×3Armored Crawler Zombie×3Charger Zombie×2Brute Zombie×2Soldier Zombie×2Neighbor Zombie×2 | 15,933 |
| Wave 2 | with the crisis | 50 | Barefoot Zombie×10Office Worker Zombie×8Nurse Zombie×8Soldier Zombie×6Armored Crawler Zombie×4Crawler Zombie×4Hulk Zombie×3Worker Zombie×3Brute Zombie×2Charger Zombie×2 | 19,078 |
From the game files8
Crisis 218
| id | 218 |
|---|---|
| CrisisID | 218 |
| StartEvent | [52486] |
| EndEvent | [52489] |
| ForecastEvent | [52485] |
| Des | Crisis_Des_218 |
| Des_Local | 协防尸潮 |
| CrisisShowType | 1 |
| CrisisShowPara | [8,9] |
| CrisisFmod | ["event:/Model/Zombie/zombie_zamen10","event:/Model/Zombie/zombie_zamen11","event:/Model/Zombie/zombie_zamen12","event:/Model/Zombie/zombie_zamen14","event:/Model/Zombie/weijizamen05"] |
| CrisisFmodTime | [11.9,8.1,12,10.2,11.2] |
| CrisisFmodGapMin | 1.5 |
| CrisisFmodGapMax | 4 |
