Their origin has been told and retold a few times, but consistencies say that they were once completely organic. As their race advances technologically, they started replacing failing parts of their body with cybernetics. Rinse and repeat for a century or two and you get Cybermen.
They look like a bit like a grumpy version of the tin man from The Wizard of Oz. They have the appearance of a robot, but these babies don’t run on diesel. They run on human bodies, which has got to be more environmentally friendly.
If you found yourself running away from a Cyberman that was trying to make you its next victim/meal, at one point during the chase it would pop its head open and eject the skull of the previous victim. Cause the walking death robot isn’t intimidating enough on its own.
Even if you refused to go down without a fight, Cyberman are damn near impossible to kill or even stop. If a Cyberman’s body comes apart, each part can move independently. Even the head. The head grows tentacle like legs so it can still move around and freak everyone out. Instant party kill.
Let’s say you get somewhere relatively safe, like a Fallout grade vault. Hermetically sealed. Underground. Massive amounts of thick lead between you and them. Good job on making it that far. Now you’re going to have to deal with Cybermats.
Small pets/weapons, which look like metallic tadpoles, that can make their way through any kind of pipe, ventilation shaft, etc. They could find a way to open the doors for the Cybermen, or they might just attack you themselves.
Then there are also Cybermites. Similar to cybermats but smaller, and can attack or start turning a human into a brand new Cyberman. I guess those little guys have more hidden parts than Tony Stark’s watch!
The good news is they’re slow. You can outrun them with a swift walk. The bad news is, if they’re after you they’re going to be around every corner, like zombies.
Wait…slow, strength in numbers, after your brain. Cyberman are space zombies! Smart space zombies! I think I might have a script to write…