Please use this Batman plot

Batman wakes up in Arkham, huge projector screen shows Black Mask offering $100M to anyone who kills the Batman. He says Batman is free to leave if he can make it to the rooftop. Mind you, the Arkham stuff begins at the end of the first act and Deathstroke is the primary candidate to kill Batman, so he plays a huge part in the film.

Black Mask is broadcasting this like a pay per view fight. Batman fights tons of bat villains before it's revealed he has a secret agenda. Nightwing, Batgirl/Oracle and Alfred are doing what they do from the outside such as investigating, fighting, etc. Catwoman is locked up and Batman breaks her out before they both fight their way to the rooftop. Black mask cornered and laughing removes his mask to reveal he is really the Joker. Whole ending of the movie is Batman vs Deathstroke having a huge fight, Catwoman ironically plays Batman and escapes, Batman chases after the Joker who tries to escape after Deathstroke defeat and he does. End of the film Deathstroke is sent to Belle Reve to Amanda Waller. She plants an explosive device on his neck and welcomes him to the Task Force X. Also a Red Hood hint and Gotham City Sirens hint after Catwomans escape.