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It cannon be stopped, but you need to defeat it.

How it works is, it spawns as a normal zombie with 1 nds's of health, slow speed, and normal damage. Once you kill it, soon it will return, with +1nb of health. And once you kill it again, it repeats the process, every 5 times you defeat it, it will become slightly faster, do 2nb of damage per bite, and there will be 2.

This cycle DOES NOT stop. However, you do not have to kill it to win the round, so as long as all other zombies are killed, you win regardless, take to long however, and this will eventually over-power your defences.

Fairly uncommon

Survivals
It will not occur in survivals, unless you activate "APOCALYPSE" mode, then it will occur, and give cash rewards, steadily increasing.

Milestones
After reaching these, it will get a extra bonus on top of what it already has.