Linking to the Mad Scientist monster page.
Thirty years ago, after a Mad Scientist did what he did and made what he made, a lowly farmer decided to do some research. He needed oil to power his machines, but didn't want to ruin the planet, so after looking endlessly for a new source of fuel, he found the Brain Slugs. These mysterious creatures produced some foul smelling slime. After realizing that he could make the slime into fuel, he decided to raise them.
What he failed to realise was that these are called ''brain'' slugs for a reason. Soon, the farmer was found dead with a hole in his head. They kept multiplying rapidly and overtook the farm.