- Joker, dressed as Batman, begins a new reign of terror in Gotham. When the real Batman tries to stop him, Joker injects him with a poison that will cause him to laugh to death, unless he can come up with an antidote.
- Joker dons the costume of his greatest rival, The Batman, and terrorizes all of Gotham. When the real Batman tries to stop him, Joker injects the Dark Knight with a poison that will cause him to laugh to death unless he can create an antidote.—Anonymous
- The Joker decides to take on the role of "Batman" and doses Bruce with Joker venom to create an arch-rival of his own.
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