Becoming a doctor requires a lot of studying and hard work. After that, it requires long hours dealing with stressful and emotional situations, and for most of us, doctors are people that we look up to and admire.
Sometimes, however, a doctor's intentions can be less than pure, especially in video games.
Some of the entries of this list have earned their place by betraying their Hippocratic Oath, taking advantage of their patients' vulnerability or trust, or simply by being the worst kind of mad scientist (yes, there is definitely a good kind - think Doc Brown from Back to the Future).
There seems to be a media fascination with doctors whose ethics are questionable at best, such as Hannibal Lecter, Nick Riviera, or even (on a lesser scale) Gregory House.
But video games are bursting with examples of the worst people ever to receive a doctorate, and they pop up in every genre imaginable.
After all, what's scarier than someone who has passed some of the most difficult and mentally demanding tests known to man, only to decides actually, they'd rather forget that, cause harm or even kill a few people?