The short answer
There is no single answer, and that is deliberate. DC Comics has published at least four separate accounts of how the Joker became the Joker: a thief in a red hood who fell into a chemical vat, a failed comedian pushed through one terrible day, a mob enforcer scarred during a heist, and a handful of versions that exist only as a story one character tells another. The one element that survives every rewrite is the vat. A man goes in, chemistry or trauma changes him, and a new person walks out with chalk-white skin, green hair and a ruined smile.
If you only read one, read Batman: The Killing Joke. If you want the version most readers grew up with, read the 1951 story. Everything else is a variation on those two.
The four origins that matter
1. The Red Hood and the chemical vat (1951)
Detective Comics #168, "The Man Behind the Red Hood," by Bill Finger, gave the character his first backstory. A small-time criminal puts on the Red Hood disguise, a helmet that makes him look like the gang's leader, so the real leader can operate unnoticed. Batman and Robin corner him at a chemical plant. He leaps into a vat of waste, swims out through a pipe, and emerges disfigured. His memory of the night blurs. He embraces the accident as a birth.
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This version is important because it stays in print for decades. It explains the laughing, the green hair and the criminal skill without ever asking whether the man was crazy before the fall or after.
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2. The Killing Joke (1988)
Alan Moore and Brian Bolland wrote the version most people now think of as canon. The Joker is a struggling stand-up comedian with a pregnant wife and no money. He agrees to help two criminals rob the chemical plant he once worked at, performing as the Red Hood. Police tell him his wife has died in a household accident. The robbers force him to keep going anyway. Batman arrives, the comedian jumps, the vat takes him.
The book ends without naming which of its own scenes are true. The Joker tells the story himself, and he admits he prefers his past to be multiple choice.
3. Batman (1989)
Tim Burton's film tied the origin to Batman directly. Jack Napier is the mob's number two man, sent to rob Axis Chemicals. Batman intervenes, Napier falls into a vat of acid, and surgeons rebuild his face into a permanent grin. The film also makes him the man who killed Bruce Wayne's parents, which the comics later borrowed loosely for a time.
4. The modern revisions
Scott Snyder and Greg Capullo reworked the Red Hood gang for the New 52 in the Zero Year arc, leaving the fall itself intact but changing the man's motives. Geoff Johns' Three Jokers played with the idea that no version is final. Todd Phillips' Joker (2019) offered Arthur Fleck, a failed clown and comedian, as a standalone origin with no Batman connection to speak of.
How to choose which origin to start with
Treat the origins like editions of the same book. Your pick depends on what you want from the story.
- You want the foundation. Start with the 1951 story, reprinted in most Joker anthologies and in Batman: The Killing Joke anniversary editions as a bonus.
- You want the psychological version. Choose The Killing Joke. It is short, self-contained and available as a single deluxe volume.
- You want the film version. Check whether you are watching the 1989 Batman, which links the origin to Batman's parents, or Joker (2019), which does not.
- You want the current canon. Read the Zero Year collections, which reset the Red Hood gang for modern readers.
What to look for in any version
- Whether the fall is an accident or a push. Accident versions keep the Joker a victim of chance. Push versions make him a victim of Batman, which changes the whole relationship.
- Who narrates. If the Joker tells the story, treat every panel as suspect. Writers use that framing on purpose.
- Whether the wife exists. The wife and unborn child appear in some versions and vanish in others, and her presence changes the story from survival to grief.
- How much chemistry is doing the work. The vat explains the skin and hair. It never explains the philosophy.
- Page count. Origin stories run short. A volume that promises a full origin and delivers forty pages of setup is padding.
Common pitfalls
- Assuming there is one true origin. DC has contradicted itself on purpose for seventy years and treats that as a feature.
- Starting with a crossover event. Tie-in books assume you already know the base story and skip the parts you came for.
- Buying a novelization instead of the comic. Prose versions add interior monologue that the art already carries.
- Confusing the 1989 film origin with the comics. They overlap, but the film's version is its own thing.
- Trusting a single wiki summary. Most summaries merge two or three versions without saying so.
FAQ
Who created the Joker?
Bob Kane, Bill Finger and Jerry Robinson are generally credited. The character first appeared in Batman #1 in 1940 as a killer with no backstory at all.
Was the Joker always the Red Hood?
No. He gained the Red Hood backstory in 1951, eleven years after his first appearance.
Did the Joker have a name before the vat?
Rarely. Some versions give him one, most do not. The unnamed past is part of the design.
Is Joker (2019) canon?
No. It is a standalone film with its own continuity and its own Arthur Fleck.
Does Batman know who the Joker was?
In several stories Batman investigates and finds the records do not match. The uncertainty is the payoff, not a loose end.