Teenage superheroes strive to prove themselves as members of the Justice League.
Bruce Wayne is missing. Alfred covers for him while Nightwing and Robin patrol Gotham City in his stead and a new player, Batwoman, investigates Batman's disappearance.
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.
