Six cover versions exist: a Direct Sales and Newsstand cover with the same art and 4 variant art covers a with hologram attached.
This issue has variants:
Joker escapes from Arkham asylum. With Batman out of town, Robin must try to figure out what the Joker is planning. The trail leads to Osgood Pellinger, a computer specialist, but Joker captures Osgood before Robin can rescue him.