Batman and Nightwing are forced to team with the Joker's sometimes-girlfriend Harley Quinn to stop a global threat brought about by Poison Ivy and Jason Woodrue, the Floronic Man.
As Gotham City's young vigilante, the Batman, struggles to pursue a brutal serial killer, district attorney Harvey Dent gets caught in a feud involving the criminal family of the Falcones.
Scooby-Doo and the Mystery Inc. gang meet up with Batman and other friends to defeat evil villains and save the day.
