DC Database

The Joker was an insane criminal who planned to drive all of Gotham City insane by using a hot air balloon to spread his laughing gas throughout the city.

During his first encounter with Batman, the Joker exposed him to his laughing gas and ran off.

After Batman recovered from the insanity the gas caused, he went after the Joker again and used a flare to burn up the Joker's balloon before its gas was able to spread.

The Joker was nearly left to die, but Batman realized that killing the Joker goes against his policies, so he saved his life at the last minute.

After his capture, the Joker ended up in Arkham Asylum and Bruce Wayne vowed to cure him even if it took the rest of his life.