So here we have the Doctor's foremost nemises
"As long as you hate, there will be people to hate."
-George Harrison-
They were created to hate. The gruesome mutants encased in skins of steel. All they exist for is to destroy – so they may rule supreme, rule alone. They can never touch, never be held by another being. They are soldiers, and all they strive for is to slaughter, to butcher, to annihilate. They have no higher purpose, no kindness, no gentleness. They were created by a madman, and their purpose is to continue his work, to continue ever on in their attempts to stamp out all life.
This was a very awkward one to write, so if anyone feels I missed out some aspect that is needed, please tell me!
Next: Cybermen