The Joker successfully broke out of Arkham Asylum on his birthday and has his eye on the Emerald of Ghulpar currently owned by the rich Van Guilders and Batman is hot on the trail to stop him.
Batman reflects on his dual role as Bruce Wayne and Batman as he fights criminals in Gotham City such as the Joker with his skills and crime-fighting gear.
The Dark Knight, otherwise known as Batman, protects Gotham City when the Joker tries to rob Gotham's First National Bank, and chases the villian into a warehouse of toys.
Rachel's birthday celebration for her friend Bruce Wayne is ruined when the Joker crashes the party, putting the guests to sleep and stealing their jewels and money, until Batman arrives and foils the Joker's plans.