- The Riddler is the primary villain and he figures out Batman’s identity.
- Arkham Asylum will figure prominently in the story.
- Several classic villains will cameo, including the Penguin and Mr. Freeze (though as Dr. Fries, not as the supervillain).
- Barbara Gordon will have a featured role.
- Commissioner Gordon will mention Metropolis and possibly Lex Luthor.
- Dick Grayson may be in the movie (though probably not as Robin).