Emperor Joker!

Teaser: From the files of the Bat-Computer, Batman and Robin battle Firefly and his Rainbow Creature in a homage to Detective Comics issue #241 and Batman issue #134.
Main Plot: After Batman defeats Ten-Eyed Man during a jewelry theft, Bat-Mite gives his powers to the Joker by mistake. He uses his new gifts to remake the world in his own image and starts killing Batman and bringing him back to life over and over again. At the same time, Bat-Mite develops a crush on Harley Quinn and vice versa.