Just discovered this thread.
In a Timeline, I am working on, Tim Burton does Batman as in OTL.
But the Second movie is based on the Prey Story from the Legend of the Dark Knight Comic.
I have Batman looking for Penguin. He know Penguin is a Crime lord who took over after the events of the first movie but he is not sure who he is. Batman has narrowed it down to 6 possible as the movie opens and as the film progressed, he will narrowed it down more. Is it the Mayor, The Business man, or the Night Club owner. I figure that we have several guest stars who would all make a good Penguin.
It will be Produced by Burton but directed by Joe Dante. I have Burton finishing up another film when the Studio wants to start Filming, so Dante is brought in as the Director.
Dr Hugo Strange will be played by Patrick Steward and I have not decided who should play Catwoman.
@Tiro mention using Killer Croc. Croc would be a better choice for the third film.
If you have the death of Flying Grayson as a plot element in the second film. Batman fails to save them and it a win for the Penguin, which is part of the reason Bruce is dealing with Hugo Strange. Add Joe Chill as a one of the Penguin men and that would add a nice subplot of the Batman dealing with his origin.
My take on the Third Film would be with the Riddler and based on the script "Simon Says" which was the basis of the third Die Hard Film.
Instead of Han Gruber, we have the master villain Edward Nygma, who is playing games with Batman on the night of Saint Patrick Day.
I like the suggestion of a black Robin. Have the boy take the place of Samuel L Jackson Zeus.
The idea of Killer Croc in the Sewers is a good one but instead of being a villain, have him be a former freak for the Circus Freak show. After the death of The Flying Grayson, the Circus closes. Dick Grayson is struggling on the Street and the Killer Croc has hidden in the Sewers. When Batman first meets Killer Croc, they fight because Croc just wants to be alone but it ends when Dick Grayson appears and recognizes him from the Circus. Then the Croc helps them.
The Reason that I have the Movie on Saint Patrick Days is the crazy Green Outfit is a Costume for that the Riddler wears to hide in the Parade as part of his plan get away.
I casting Tommy Lee Jones as the Riddler. He is a darker character who a master planer and pulling off a huge robbery. One of his bombs hurts Harvey Dent (Billy Dee William) destroying half his face as the DA is saving innocents.
At some point, Dick Grayson, puts on his Circus Outfit and a face mask as he teams up with Batman to stop the villain Get Away. He become a good street fighter since the circus has closed and he holds his own in the fights. As the film ends, Grayson offers to help Croc but he refuses. And Bruce is telling Harvey that he will get him the best doctors to heal his face. Harvey does not say much but is just lying in bed, flipping his two head coin.
We then see Grayson in a version of the Robin Outfit, this time with some body armor as in the original movie. Batman come up next to him and then we hear a woman scream and the film end as Batman and Robin swing into action