The joke's on you, Batman!
"The Joker is stirring up trouble again in Gotham City, but this time he has an ace up his sleeve: a computer virus that can wipe out all Gotham City's technology in an instant! Can Batman thwart the Joker's plans? It's the ultimate showdown between the Dark Knight and the Clown Prince -- or shall we say King? -- of Crime!"--Back cover.