How to keep a Joker when the actor is gone

We open a scene of the next Batman movie in a chemical plant. Joker is standing on the highest beam on the building, laughing manically.

Innocent workers scream in fear as they dangle of a vat of chemical that the joker has set up for them. The tall clone turned into the dark as he waited for the Dark Knight to make his appearance. The Joker wheezed and coughed from the chemical for a moment before letting his uncontrolled laugh break free again.

“Hehhhhh, hehehheheh…ahaahahaahahahahah!!” He coughed again and licks his lips. “Wh-what are you all afraid of?” He placed his left hand on his hips and held up a remote control with the other. “He’ll be here soon.”

A man with thick glasses and a bald head sneered at the clown. “You bastard!! Why are you doing this!!!?”

Another man in a button down shirt joined in. “What do you want from us!?”

The clown fluttered his eyelashes and grinned. He made a smacking sound with his tongue against his lips. The captives watched as the man did so for a while. The one woman there began to feel sick from the toxic fumes below them. She couldn't take watching this clown with a dry mouth problem anymore.

“Answer him!!” She shrieked as a playing card flew passes her face. She was now bleeding. “AHHHH!!!!” She cried as the other began to panic again.

Joker jumped from the beam and hung from a lower beam. He suppressed another chortle while he swung back and forth. “I’m waiting for the only thing that is real in this world.”

The captives looked on, waiting for an explanation that they didn’t need. The villain let out a blissful sigh and shut his eyes.

“Don’t you worms see? The only thing real in this world is…” Licking his lips again. “…pain.”

He swung back up to the catwalk as if it were a circus act, but got his foot stuck and fell over on his face.

“Hehehhhheeeehehhhehehe!” Standing up. “Just like that!” He turned to the prisoners with a bloody smile on his carved face. “You see-you see I’m saying now?” He started pressing the button to lower them. “None of you are real!”

The workers cried in horror as the Joker continued his line.

“The only thing that is real is pain!” He lowered the remote and licked his mouth once again. “The Batman causes me pain, as I do to him!” His smile grew as he showed off his yellow teeth. “Thus, he is real and none of you are! You and the rest of your dirt-eating worms are just something we dreamt up to provide that pain we need to be real until we meet again!!”

The bald man shouted. “You’re crazy!!”

“Flattery won’t save you!” He winked and flipped the man off.

A deep raspy voice spoke. “And neither will it help you!”

Then there was loud crack fallowed by a sudden surge of pain sent through the Joker’s head. All he saw was a flash of pure black with a hint of white. He didn’t have to see to know what harmed him. The freak in make up hit the metal floor. He could feel a rib break as he looked up to the perpetrator.

“What is your game this time, Joker!?” The voice roared as the man emerged from the shadows to lift up the clown prince of crime. “I said, what is your game!!?”

Blood bubbled out of the Joker’s mouth and he raised his hands to his rival’s. His yellow smile was now orange as he spoke. “It’s all in the game of love, bat-breath!”

The Joker then deployed the blade in his shoe and kicked upward. Batman jumped back to avoid the metal as the Joker flipped back.

“And what do I love?” He stood in the dark, holding the remote. “The thrill of the hunt!! HHHAHHAHAHAHAHAHHAHAHAHA!!!”

Joker threw the remote into the toxic waste and took off into the shadows. Batman lunged for the device but failed to obtain it. He looked to the scared worker as they looked back at him.

“Save us, you fool!!” Shrieked the woman.

“Shut up!” Shouted the bald man. “He killed al those cops!”

The other man pitched in. “Yeah! He’ll kill us too!”

The Batman bared his teeth and shot the Bat-cable to pull them in. He untied the victims.

“Get away from us, you cop killer!” Shouted the man with a button down shirt. He and others soon ran out of the building, leaving their hero alone. Then that stupid laugh begun again. The Joker’s sour voice rang threw the warehouse as if he were on a speaker.

“Awww, even after you save them…”

“Where are you, Joker!!?” Batman looked sound in the dark. “Don’t you hide from me!!”

“Heheheheheheh…just look up.”

The vigilante’s eyes shot upward to see the Joker was handing from his feet on the tallest beam. Immediately, Batman shot his Bat-cable and flew to the Joker. The moment that clown was close enough, the knight sent his fist deep into the other man’s face. No time recoil in pain! The Joker was then thrown across the catwalk! Batman came closer and lifted the battered jester. That scared smile just grew more with each hit. After a nasty sputter of blood, the painted man cackled.

“HHHAHHAHAHAHAHAHHAHAHAHA!!” Joker then coughed up more blood. “You know what I like and how I like it!! Heheheheheheh…” He smile grew again as he was thrown to the ground.

“You’re going back to Arkham!” Barked the Dark Knight.

“That’s…why I like you.” Joker sat up and continued to smile. “You know why I chose this place?”

“Don’t care!” Batman picked him up again and proceeded to restrain him.

“I used to work here.” His smile faded a little. “And I HATED IT!” The Joker pulled out a peering knife, cut through his restraints and stabbed Batman in the arm. With ropes still tied to one of his legs, the Joker spun around to see the Batman on the floor. He couldn’t help but laugh.

“Ssssoooorrryyy, Batsy!” He held in a giggle. “But I win this round!”

Just then, Batman shot up to tackled the freak. The sudden blood loss threw the hero off though and he knocked the Joker off the railing.

“Joker!!!” Called out the bat in his real voice.

A shriek was all he heard before splash. The Batman looked over the railing in horror. Joker had fallen into the chemicals.

“AHHHHHHHHHHHHHHHHHHHHH!!!!!!!!!!!!!” The Joker’s earsplitting screams were only matched by the sizzling of his flesh.

Batman couldn’t watch as he thought of his rival dying below him. Police sirens are heard in the distance and the Batman left. Joker continued to thrash in pain until the vat tipped over and he lay there in agony. When the cops and paramedics arrived on the seen, there was no one there. No workers, no Batman, no Joker. Outside of the plant, we see the Joker, stumbling to the polluted river where the plant drains it waste. He throws himself into the water to ease the pain in his flesh. It didn’t help much. He rose from the water to see that his hands were pure white. Had his make up fused with his body? Joker felt his face and his scars were gone!! Not only that…his smile had grown three times larger. Joker looked into the water and screamed. His face had changed. The usually smudged make up he wore was now gone…but remained under his skin. He screamed once again, but the screamed faded to laughter. Joker ripped at his solid green hair and cackled insanely. If there had been any sanity left in the Joker, it died that night. The police came to lock him up in Arkham.

Now we continue the movie.