The Demon

And then we have another story that showed how great The Joker was, and to what lengths he would go to mess with The Batman. Endgame explained how he was able to survive his many encounters with the Dark Knight, and how he managed to come back every time, despite being repeatedly beaten senseless.
So what if he were actually an immortal who used to be a regular human until he came into contact with a particular substance from the Lazarus Pit? What if this immortal being emerged in Gotham time and time again, whenever the city was tested by catastrophic events and other (even manmade) disasters? This could work brilliantly, even if the movie were to remain grounded.
Who said we couldn’t have a story about immortals that wasn’t far-fetched? Especially if we treated immortality like a metaphor, as Batman Begins did.
