From Data Realms Wiki
These units are cheap, emergency use units. They are not equipped with jetpacks and are pretty fragile, generally speaking.
A reanimated skeleton for use as a cheap troop and cannon fodder. Sometimes a dead skeleton is used for a decoration in scenes.
A half baked clone that is just a little more fleshy than a skeleton. At least it can stop bullets.
This zombie is as close to the real deal as it will get...but that's not saying much.
A zombie that was left in the tube a wee bit to long and is now slower and fat, but that fat makes it a bit more durable (for a zombie that is). They make reliable miners.