When it hits
When the story calls it on the Student's run
Part of 
Aid Response Horde, starts with Wave 3 - Day 1.
The same wave on the other runs: Wage Slave, Warehouse Manager
Who comes, and where
40 zombies: 22 door · 18 window.
Every zombie in it has ×2.21 HP, bites ×8 as hard, bites ×1.2 as often, on top of the horde setting.
At the door 22
| Zombie | How many | At once | HP each | Bite |
|---|---|---|---|---|
| Office Worker Zombie | 4 | 3 | 287 | 8 |
| Nurse Zombie | 3 | 2 | 243 | 8 |
| Barefoot Zombie | 3 | 2 | 177 | 8 |
| Hulk Zombie | 2 | 2 | 1,105 | 64 |
| Armored Crawler Zombie | 2 | 2 | 420 | 16 |
| Worker Zombie | 2 | 2 | 442 | 16 |
| Crawler Zombie | 2 | 1 | 221 | 8 |
| Charger Zombie | 1 | 1 | 884 | 48 |
| Brute Zombie | 1 | 1 | 575 | 24 |
| Soldier Zombie | 1 | 1 | 486 | 32 |
| Neighbor Zombie | 1 | 1 | 199 | 8 |
At the window 18
| Zombie | How many | At once | HP each | Bite |
|---|---|---|---|---|
| Office Worker Zombie | 4 | 3 | 287 | 8 |
| Worker Zombie | 2 | 2 | 442 | 16 |
| Crawler Zombie | 2 | 2 | 221 | 8 |
| Nurse Zombie | 2 | 2 | 243 | 8 |
| Barefoot Zombie | 2 | 1 | 177 | 8 |
| Hulk Zombie | 1 | 1 | 1,105 | 64 |
| Charger Zombie | 1 | 1 | 884 | 48 |
| Armored Crawler Zombie | 1 | 1 | 420 | 16 |
| Brute Zombie | 1 | 1 | 575 | 24 |
| Soldier Zombie | 1 | 1 | 486 | 32 |
| Neighbor Zombie | 1 | 1 | 199 | 8 |
What beating it pays
A wave's total HP sets its reward tier. Each tier pays its reward, and the zombies you kill leave loot on the ground.
| Zombie Horde Intensity | Total HP | Reward |
|---|---|---|
| Weak | 11,952 | Tier 3 |
| Standarddefault | 15,933 | Tier 4 |
| Strong | 19,915 | Tier 4 |
| Very Strong | 23,885 | Tier 4 |
The game also adjusts each wave to how ready your home is (doors, defenses, supplies and how the last wave went), so the HP here is the starting point.
From the game files2
TowerWave 4123
| ID | 4123 |
|---|---|
| EventID | 52486 |
| OwnerCrisisID | 218 |
| ZombieTypeList | [9108,9111,9110,9105,9104,9102,9109,9103,9106,9101,9107] |
| ZombieCountList | [2,1,2,1,1,2,2,4,3,1,3] |
| MaxAliveCount | [2,1,2,1,1,2,1,3,2,1,2] |
| ChargeThreshold | 0.2 |
| TargetSlotTypes | [8] |
| AttackMultiplier | 8 |
| HpMultiplier | 2.21 |
| AttackSpeedMultiplier | 1.2 |
| SpawnAnchor | ZombieSpawn_01 |
| SpawnInterval | 2 |
TowerWave 4124
| ID | 4124 |
|---|---|
| EventID | 52486 |
| OwnerCrisisID | 218 |
| ZombieTypeList | [9108,9111,9110,9105,9104,9102,9109,9103,9106,9101,9107] |
| ZombieCountList | [1,1,1,1,1,2,2,4,2,1,2] |
| MaxAliveCount | [1,1,1,1,1,2,2,3,2,1,1] |
| ChargeThreshold | 0.2 |
| TargetSlotTypes | [9] |
| AttackMultiplier | 8 |
| HpMultiplier | 2.21 |
| AttackSpeedMultiplier | 1.2 |
| SpawnAnchor | ZombieSpawn_02 |
| SpawnInterval | 2 |