Deadpool got into the Bat Jet with Batman as they then flew out of the Institute. "Finding the coordinates to ACE Chemicals... now." said Batman as the Jet followed the trail. It took them probably less than an hour. ACE Chemicals was the exact same place where Batman fought the original Red Hood that would drop into the chemicals that would turn him into The Joker. The Jet then parked outside ACE Chemicals. "Chewie, we're home," joked Deadpool as the Jet opened up. Not even a laugh from Batman. They got out, the hatch closing. "We're doing this by the book," ordered Batman. "Yeah, yeah, I know," said Deadpool as they walked to the front door, "but do we have to knock?" Batman got out a spray can. "Care to do the honors?" asked Batman as he gave Deadpool the spray can. Deadpool knew what this was. Explosive gel spray. He sprayed a big X, and Batman activated the gel, blowing up the door. "I've got to get me one of those," said Deadpool as he and Batman went into the factory. "Looks uglier than Weapon X," commented Deadpool as he looked around to see if he could at least find Harleen. "Hey Wade! What's my name?" Ajax called out. Batman and Wade looked and saw Ajax. "YOU!" Deadpool yelled, ready to not do things by the book, and shove said book up Ajax's ass. Batman put his hand on Wade's shoulder, stopping him. "I'll deal with Francis," said Batman, "you save Harleen." 

"You're gonna need more Batarangs," said Deadpool as he looked for Harleen. He walked past some giant cauldrons with a pool of the same chemicals that turned one ordinary man into the Clown Prince of Crime. Up on the top, was The Joker with a dazed, confused, and scared Harleen. "W-where am I?" asked Harleen as she looked around. "Tell me something Harley," said Joker, "ever had a bad day?"

"Harley!" Wade called out to Harleen. She smiled. "Wade!" she said with hope. "Oh Wade ain't gonna save ya this time!" Joker taunted "But, since he's going to be awhile, I'll get my point across. You see, I belive that all it takes is one bad day to reduce the sanest man alive to lunacy. That's how far the world is from where I am. Just one bad day. And this grim hellhole was the final piece in my one bad day. At least, that's what I think... sometimes I remember it one way, sometimes another... if I'm going to have a past, I prefer it to be multiple choice!" He then chuckled. Wade got up the stairs. "And now Dr. Quinzel, your one bad day shall start," said Joker. "Please, I want to go home..." begged Harleen. Joker then started laughing. By then, Wade made it. "Hey motherfucker, she asked to go home. I'd do what she says," said Deadpool. "Who's gonna make me?" taunted Joker. "I sure will," threatened Deadpool as he got out his swords, "I'm about to do to you what Furry Vengeance did to Brendan Fraser's career!" 

"Not if I have anything to say about it," said Joker as he then pushed Harleen off the top, "have a nice trip, see ya next fall!" Harleen screamed as she fell, her right shoe falling off. Wade gasped in horror. He then glared at Joker as he then tackled him and beat him up, yelling obscenities. Joker continued to laugh. "Stop that fucking laughter!" Deadpool yelled. By then, Harleen fell into the pool of chemicals. SPLASH! Deadpool then impaled Joker's shoulder with his sword, sticking him to a wall. "Trash man should pick up the garbage some time soon," said Wade as he then looked around to see if there was a way to drain the chemicals. He found a specific drainer for the exact pool Harleen fell in, and pressed it. The chemicals were then drained. Wade went to the cauldron, and was shocked to see what happened to the unconscious Harleen.

Her clothes were torn, and her bra, which was apparently pink, was exposed, and she was now barefoot. But that wasn't all. Her appearance was altered. Her Caucasian skin was now bleached into a chalk white. Her lips were now peeled to a scarlet color. Her nails were a dark blue. Her blonde hair was a bleached blonde white, but the bottom of her hair was in various colors. I say apparently pink on her bra because the colors of her once pink bra and blue blouse had melted from the chemicals, and those colors had touched the bottom of her hair. The right side of her hair was pink, and the left side of her hair was blue. Deadpool got into the cauldron. "Harley, wake up!" he said, going to her. He didn't care if her appearance was altered. He didn't want to lose her. "Please, don't die on me! I love you!" He then performed CPR on her. She then gasped, inhaling and exhaling. "Harley!" Wade exclaimed in relief, "I thought I lost you!" He hugged her tightly. "Wade...?" she weakly said. "It's me Harley," said Wade, tears in his eyes, "it's me..." She smiled weakly as Wade held her in his arms.