invader

Witness deadly wars between billions of invaders and cells, learn how your immune system actually works and protects you from cuts, cancer and Covid.

Some of it could be about the nature of the invaders and the, the effectiveness of their military, all that kind of stuff.

If things go well, your first line of defense kills the invaders quickly.

If the leafcutters are not able to repel the invaders, or at least barricade enough of their entrances in time, the army ants swarm the nest, overrunning all opposition.

Only if your cells can make this distinction between friend or foe is your immune system able to fight an invader.