Little is known about the early life of the man who goes by the name Doctor Moon. Indeed it is suspected that his title is unearned as no record of his accreditation can be found. "Genius can neither be confirmed or denied by a piece of paper" says Moon.

Indeed, Moon's skills as a surgeon cannot be questioned. Unfortunately, he has always put them to use on the wrong side of the law. "Law is nothing more than the weight of common opinion," he says. Moon has been hired to use his nefarious medical skills in one nefarious scheme after another. That these schemes constantly violate the Hippocratic oath does not seem to bother Moon. "Only a fool is bound by the words of one who is long dead", he says.

Over the years, Moon has travelled from job to job, usually operating in secret. He once reprogrammed a piece of catscan equipment in order to turn a reformed Catwoman back to her evil ways. He was also responsible for "brainwashing" Plastique in Belle Reve Prison.

When asked why he does not use his obvious skills to heal the sick, Moon replies, "Healing is the body's natural process, and is therefore dull and commonplace. I am an experimenter - a pioneer, a misunderstood visionary." The Police of 6 continents would like to talk to Doctor Moon.