
Serpentor is a supporting antagonist in the G.I. Joe series. In the original 1980s G.I. Joe: A Real American Hero animated series, he's the main antagonist in the second season, as well a secondary antagonist in the animated film. He serves as the Cobra Emperor of the Cobra organization, and is proven to be a very pretentious and arrogant sadist.
He was created by Dr. Mindbender, Destro, and the Crimson Twins merely because they grew tired of Cobra Commander's failures to take over the world. Serpentor was created using DNA of some of history's greatest villains and conquerors, such as Napoleon, Ivan the Terrible, and Alexander the Great. Sun Tzu's DNA was almost acquired, but foiled by G.I. Joe, so the DNA of Joe trainer named Sgt. Slaughter was substituted.
Once created, Serpentor overthrew Cobra Commander, and proved to be a more effective leader, but was ultimately more of a monster than a man. Extremely grandiloquent and sociopathic beyond words, Serpentor viewed everyone, specifically Cobra Commander, as beneath him, and would often berate his henchmen with cruel words. Not even his "father", Dr. Mindbender, was above his harshness. Eventually, Serpentor was betrayed when Cobra Commander regained control of Cobra by using science to transform him into an iguana, at least temporarily.