"Here's the rules," Mxy said before they could get sidetracked. Bat-Mite was his best buddy but he had a tendency to be scatter-brained. "You've changed bodies for forty-eight hours." He brandished a watch marked, improbably, up to "forty-eight o'clock." "You have to live each others' lives for that long. And if anyone guesses about the switch, the change will be...permanent."

In a universe where Bruce Wayne is willing to kill, the Graysons never fall. His family alive, Dick Grayson stays with the circus. He's happy. Tim Drake grows up in Gotham while his parents travel the globe. He has tutors and a lot of money and a camera. He's not happy, but he's almost okay with that because he has Dick. Even if Dick doesn't know it.

It's not necessary to be Superman to be a hero, but Dick has trouble getting the new kid to believe that.