When you think of the Joker, who comes to mind? The evasive Joe Cool character who stands opposite of Batman? Geoff Johns wrote three separate Jokers into his Rebirth Storyline. Even Bruce Wayne's own mother, Martha, appears as the Joker in Flashpoint. So who is he? And is there really more than one? Let's dive into the dynamics of the most notorious villain in comics history and cover the conspiracies on his elusive past.