Will the Real Joker Please Stand Up?

After Batman foils several of the Joker's schemes before he can give the punchline, the Joker worries he's becoming predictable and decides to spend some time away from Gotham. Unbeknownst to him, while he's gone, a copycat Joker appears and starts committing crimes that fool everyone, even Batman and Harley...thanks to blackcat9517 and J-Eazy98 for the suggestions! :-)