Batman Arkham City: End Game #4

When Batman arrives at Arkham Asylum to follow up on a clue, it forces him to remember an early encounter with the Joker, one that tied in to a terrifying attack on the citizens of Gotham. What connection does this past episode have to the arch criminal's current plot from beyond the grave?

Written By:
Derek Fridolfs
Pencils:
Jason Shawn Alexander
Inks:
Cover By: