Mad scientists aren't necessarily evil; they're just crazy. Some, like Flipping Hades Terwilliger, just want to make computers out of avocados. Is that so wrong?

Researchers, doctors, and various scientific types who delve too deeply into Things Man Was Not Meant To Know. They create hideous and ungodly monsters. They perform unnatural experiments on innocent people. They seek to conquer or destroy Earth. They try to make friends with obvious alien menaces. They are prone to fits of maniacal laughter, and they prefer to wear white lab coats. They rarely bathe or comb their hair. People laughed at them in University, but they'll show them! They'll show them ALL!