Something has been bugging me for month’s: Where is the Joker?
He’s not the kind to let grass grow under his feet (that’s Poison Ivy’s gig).
But in all the chaos, he’s not to be found.
The last we’ve seen of him, he was killing Alexander Luthor…and following Lex Luthor around like a trained dog. Mind control? That would give the Joker a sense of direction. Potentially scarier than he is usually.
Where is the Joker? 
Well, see, the Batmobile lost a wheel…
He just appeared in Detective Comics, where he took Robin on a Holiday joyride. He escaped at the end.
Then he reappeared in a previously published Batman story. A demented cop dressed as Batman shot him in the face. Joker survived but is in custody. Batman will follow up on the consequences of, as far as the Joker can tell, Batman finally trying to kill him.
As for what he did during the Lost Year, well, Batman wasn’t around to bother so his usual activities lost a lot of their appeal.
He’s Supernova - shh, don’t blow the big secret!
C’mon cmk, you gotta spoiler that stuff! 
He’s right here!!