Yang

Take a popular character and introduce us to the evil version of this character.It's a favorite Soap Opera device. It's also very prevalent in genre shows, where the events may happen in an Alternate Universe. Often, in science fiction or fantasy, the Evil Twin is created from the original character by Applied Phlebotinum. Most of the time, this results in a "Good Twin" and "Evil Twin", neither of which are complete entities on their own.