Batman: Harley and Ivy (2004) #3

The slam-bang finale to the miniseries by Dini & Timm, guest-starring Batman! Poison Ivy and Harley Quinn slink back into town with the hard-won Zombie Root, only to blow their own cover as they discover that Hollywood's trying to make a bundle off of their infamy! And when Batman catches up to them, this movie's really gonna blow its budget!