The Joker became the Joker in most tellings by falling into a vat of chemicals while pulling a crime as the Red Hood. The chemicals bleached his skin white, turned his hair green, and broke his mind. DC has never locked that story in place, so his origin survives as a stack of competing versions.
What is the original Red Hood origin story?
When the Joker first appeared in Batman #1 in 1940, he had no origin at all. He was a criminal with a clown act, and readers learned nothing about where he came from.
Bill Finger supplied the backstory in Detective Comics #168 in 1951, in a story titled "The Man Behind the Red Hood!" A criminal called Red Hood led a gang, Batman chased him into a chemical plant, and he jumped into a vat to escape. He came out as the Joker and kept the identity for the rest of his life.
That scene set the template: a heist, a chase, a vat, and a man with a new face. Later writers kept the beats and swapped out the man inside them.
Who Plays the Joker in the Movie? A Film-by-Film Answer Guide
Who created the Joker and where did the look come from?
Bob Kane, Bill Finger, and Jerry Robinson created the Joker for Batman #1 in 1940. The grin came from Conrad Veidt's role in the 1928 film The Man Who Laughs, a silent movie about a man cut into a permanent smile.
- First appearance: Batman #1, 1940
- Debut look: white skin, green hair, red lips, purple suit
- Visual source: Conrad Veidt in The Man Who Laughs (1928)
What did The Killing Joke add to the origin?
Alan Moore and Brian Bolland published The Killing Joke in 1988 and gave the Joker a full backstory for the first time. He was a failed stand-up comedian with a pregnant wife, short on cash, pushed into helping two criminals rob a chemical plant.
The robbery goes wrong. His wife dies in a household accident, the criminals force him into a Red Hood costume, Batman shows up, and he falls into the vat. Moore ends the flashback on the Joker's line that if he has to have a past, he prefers it to be multiple choice.
What do the chemicals do to him?
The vat bleaches his skin, dyes his hair green, and leaves his face stuck in a rictus grin in several versions. His sanity goes with it, though the degree shifts by writer, from flat psychosis to cold calculation.
What does "one bad day" mean?
The Killing Joke argues that any sane man breaks after one terrible day, and the Joker sets out to prove it by tormenting Commissioner Gordon. Gordon holds on, which leaves the theory unproven. The book never says the Joker is right, and that doubt is the point.
How does the Red Hood gang work in modern comics?
Scott Snyder brought the Red Hood gang back during the New 52, with the Joker running the gang before his fall. Members wear red hoods to hide their faces, which lets the future Joker blend in with ordinary criminals. The reboot kept the chemical vat and dropped most of the comedian material.
How do film versions explain the change?
Tim Burton's 1989 Batman made the Joker a mob enforcer named Jack Napier. He falls into a vat at Axis Chemicals after a fight with Batman, and the film ties him to Bruce Wayne by making him the man who killed Wayne's parents.
The Dark Knight (2008) explains nothing. The Joker tells a different scar story each time he is asked, and the film never confirms one.
Joker (2019) moves the origin to Gotham's welfare system. Arthur Fleck is a failed clown and would-be comedian with a neurological condition, and his turn happens on a live TV show, not in a chemical plant.
Is the Joker's real name ever revealed?
Not in main DC continuity. Jack Napier comes from the 1989 film, Arthur Fleck from the 2019 film, and comics have floated names like Jack and Joe without settling on one.
Three Jokers, by Geoff Johns and Jason Fabok, ran with the idea of three separate Jokers in 2020. The story treats the origin as a puzzle instead of a fact.
Why does DC keep the origin open?
A fixed backstory makes a villain explainable, and the Joker works best when nothing about him can be pinned down. Leaving the past blank also lets each new creative team start fresh.
How did the origin spread beyond comics?
Cesar Romero played the character on the 1966 TV series with no origin at all. Batman: The Animated Series (1992) left the past alone and built the character from behavior instead.
Frequently asked questions
Did the Joker fall into acid or chemicals?
Comics call it chemicals, often a vat at a chemical plant. "Acid" shows up in fan talk and in some adaptations, but the printed stories stay vague about the contents.
Was the Joker a comedian before he changed?
In The Killing Joke, yes. In most other versions, no. DC treats the comedian angle and the gangster angle as two possible pasts.
What was the Joker's first appearance?
Batman #1, published by DC Comics in 1940.