The Joker is arguably one of the greatest villains in pop culture history. The complete antithesis of Batman in almost every regard, many say he the hero's perfect adversary. His origins are shrouded in mystery, making it impossible to determine who he is and where he came from. This theory, however, could explain who he is, and why he is so obsessed with Batman.

Keep in mind, this is merely a Fan theory.

The Joker, in reality, is Bruce Wayne's older brother. For story purposes, we'll call him Jack. Jack was born around 5-10 years before Bruce, and he seemed like a normal child at first. However,...