Disclaimer: I do not own DC Comics or the CW TV shows Arrow, The Flash, Supergirl, Legends of Tomorrow or Batman comics or any other characters or elements pertaining to the mentioned franchises.

"We have to move!" Batman ordered as Titan Joker threw a big piece of debris at them as Green Arrow and Batman dodged.

Green Arrow fired an explosive arrow, hitting Joker in his shoulder as it exploded and the behemoth clown groaned in pain but looked annoyed. "That hurt. You look a bit green, Merida, let's see if I can make you feel better!"

The Joker rushed at Green Arrow, who rolled away and kicked Joker in his knee, causing for him to kneel down but Joker swung his arm, swatting the Green Arrow away.

Batman jumped at the Joker and covered his eyes, blinding him as Joker tried to shake Batman off. "Get off me! I said, get off me, now!"

In a desperate move, the Joker jumped up, crashing through the roof as he laughed maniacally and Batman was forced to let the Joker go, while Green Arrow rappelled up with a grapnel arrow.

"You two have caused enough trouble for one night." Joker sneered. "And for that, I'm going to paint the whole Arkham with your blood! Hahahahahaha!"

Supergirl flew towards the Joker, hitting him hard in the chest as he staggered. "Steroids much? I gotta say, that's quite unhealthy."

"Oh, a cheerleader in cape, how sweet. I bet Harley will love your dress, Barbie." Joker laughed as he attacked but Supergirl grabbed his fist as the shockwave knocked Batman and Green Arrow back.

Supergirl hit the Joker in his chest as he staggered before the Flash sped to the rooftop and threw a lightning bolt, knocking Joker back.

"Enough!" The Joker snapped as he did a thunderclap and the shockwave knocked Supergirl and the Flash off the roof.

Green Arrow fired two arrows at Joker's knees as he hissed before the Green Arrow tried firing another arrow but the Joker ripped a piece of debris from the roof, throwing it at the Batman and Green Arrow as the wall behind them collapsed down onto them.

"Poor Batsie and poor Greenie. No sidekicks, no friends, all alone…"

"They're not alone!" Batwoman shouted, throwing an explosive batarang at the Joker's shoulder as he screamed in pain upon explosion.

The Joker turned to Batwoman, glaring. "Why you little…"

He rushed at Batwoman, who dodged, rolling down as she sliced Joker's legs with batarangs before she fired her grapnel at Joker's back and jumped off the roof, pulling the Joker down as he screamed and fell off the roof. "Aaaaaaaaahhhhhh!"

"Everybody out of the way!" Spartan ordered as the Joker fell down and hit the ground hard and a cloud of smoke burst out. As the cloud dissipated, they looked to see a hole, in which was the Joker shrinking and his skin was gaining normal color before it turned normal and showed a very beaten John Deegan as they sighed in relief.

"Joke's on you, creep." Wild Dog sneered.

The Joker was defeated.

Later, Deegan was in a medical treatment, in restraints, still looking a bit like the Joker and quite beaten up, in a body cast.

"How is it possible that Deegan was the Joker?" Batman questioned.

"From what I could read from his notes, Deegan had multiple sessions with the Joker and… testing hypnosis and… how to preserve one's personality. The Joker was his test subject." Leslie explained. "He was trying to figure out how to induce a split personality into another person…"

"And he turned himself into the Joker in the process." Gordon realized. "We found samples of Bane's Venom steroid in his laboratory. Apparently, he was running some tests on the inmates here."

"Let's make sure he won't hurt anyone ever again." Batman said as they turned to Deegan, who was on a gurney in a body cast.

"Batman…" Green Arrow dragged Batman aside. "Who was that woman? Someone from your team that I don't know about?"

"It's… complicated." Batman said. "She's… an occasional ally but we have… an uneasy relationship."

So, what do you guys think? The next chapter will be the concluding epilogue.

Please review and let me know if you have been enjoying this and want for me to continue.