Batman / Batman Joker

Are Joker and Batman Canonically Brothers?

The relationship between Batman and the Joker has always been one of the most intriguing aspects of the Batman universe. Fans have been debating for years whether they are just archenemies or something more.

One of the most popular theories is that they are actually brothers. But is this theory true Let’s dive into the evidence.

Origins of the Theory

The theory that Batman and Joker are brothers gained traction after the release of “Batman: White Knight” by Sean Murphy in 2017. In this comic book series, Joker claims that he and Batman are brothers. This revelation shook the foundation of the Batman mythology, and fans were left wondering if there was any truth to it.

The Evidence for

There are a few pieces of evidence that support the theory that Batman and Joker are brothers:

  • Physical Similarities: In some versions of their origin stories, both Bruce Wayne (Batman) and Jack Napier (Joker) fell into a vat of chemicals, which altered their appearance. This could explain why they look so similar.
  • Emotional Connection: The Joker often seems to have a personal vendetta against Batman, beyond just being his nemesis. He seems to take a particular pleasure in tormenting him, which could be explained by them having a shared history.
  • Batman’s Real Name: In some versions of the story, Bruce Wayne’s real name is revealed to be Thomas Wayne Jr., making him the younger brother of Thomas Wayne Sr., who is also known as The Joker.

The Evidence Against

While there are some compelling reasons to believe that Batman and Joker are brothers, there is also evidence against this theory:

  • Unreliable Narrator: The Joker is not a reliable source of information. He is known for playing mind games and manipulating others.

    It’s possible that he is lying about their relationship to mess with Batman.

  • Multiple Origins: The Batman universe has been rebooted and retconned multiple times over the years, so there are many different versions of their origin stories. It’s possible that in some versions they are brothers while in others they are not.
  • No Confirmation: While there have been hints and suggestions that Batman and Joker are brothers, there has never been any definitive confirmation from DC Comics or anyone involved in the creation of the Batman mythology.

The Verdict

So, are Joker and Batman canonically brothers The answer’s complicated.

While there is some evidence to support the theory, it’s far from definitive. Ultimately, it comes down to how you interpret the various versions of their origin stories and the relationship between them.


In conclusion, the theory that Batman and Joker are brothers is a fascinating one that has captured the imagination of fans for years. While there may be no definitive answer, it’s fun to speculate about the possibility of these two iconic characters being related. Who knows what other secrets lie hidden in the world of Batman