On the night of a heist of Ace Chemicals planned by the Red Hood gang, Batman learns of the gang's plan and intercepts them at the chemical plant. Batman confronts the gang's leader, the Red Hood, who is submerged in a vat of chemicals after the heist fails. In "Mystery of the Red Hood" and The Killing Joke, the Red Hood intentionally dives into the tank while trying to escape Batman; other depictions, such as the 1989 film, have Batman accidentally causing the Red Hood to fall into the vat.