Gotham is once again in danger. And the only hero this city deserves is Batman, the alter ego of billionaire Bruce Wayne, who lives in his huge family estate with his butler Alfred. But this time the superhero is forced to take as his partner a boy named Dick Grayson, whom he, without remembering, adopted at a social gathering. The new Robin will keep Batman company in the fight against his nemesis Joker, who escaped from Arkham Asylum, and also Harley Quinn, who is ready to commit the craziest atrocities in order to make fools of the whole Justice League, including Batgirl.