Those pesky humans. We, Evil Overlords have a tough job with them. They can be set to slaves, but only for relatively short period of time. They promise you loyalty ... and snap! There is a knife stabbed in your back.
Let's get rid of humans and develop servant creatures
Step 1: Killing them all
I am Evil Genius and I possess DNA manipulation device, which can create me any animal I would like. Now it is time, to develop a creature which can kill as many people as possible.
But, how should such animal look like?
And: While simple rats or mosquitoes are great killing machines, they do not kill humans directly. They are just helping diseases to spread. I want this to be personal. I want the animal directly attack humans and kill them. And eat them (who has time to hide all the bodies?)
I call you, my evil henchmen. What do you suggest?
EDIT Oops! I forgot one vital info: I am human too. So those creatures should not kill me. Obviously ;)