"Diva Las Vegas": While patiently waiting in an unknown location, Harley and Red Tool play games to pass the time. Red Tool suggests "Truth or Dare" and asks Harley to tell him of the experience that she had in Las Vegas during her road trip with Poison Ivy and Catwoman.
Harley Quinn 25th Anniversary Special #1 is a one-shot with a cover date of November, 2017. It was published on September 13, 2017.
Appearing in "Diva Las Vegas"
- Traffickers (Dies)
- Sam Goldstones (Dies)
- Larry the Butler
Synopsis for "Diva Las Vegas"
While patiently waiting in an unknown location, Harley and Red Tool play games to pass the time. Red Tool suggests "Truth or Dare" and asks Harley to tell him of the experience that she had in Las Vegas during her road trip with Poison Ivy and Catwoman.
While on the road, Ivy is constantly distracted by Harley informing her that she has to go to the bathroom, that she ends up driving into the middle of a police car chase. She knocks the crooks off the road and into a ditch. As a thank you for returning his money, Sam Goldstones invites the girls to stay in the presidential suite, of his casino, for the weekend.
Bored out of her mind, Harley decides to throw a party in the room and invites the entire casino staff and entertainers! Soon the party gets out of hand and catches Sam Goldstones' attention. But before he can put a stop to it, he accidentally gets hooked onto Harley's motorcycle. Harley jumps off and lands softly in the crowd while Goldstones and the motorcycle crash through the window and plummet down onto the Vegas Strip.
When Red Tool asks what happened next Harley is mum, saying that she pinky swore not to tell anyone what happened beyond that point. Before they can continue, Harley hears people outside. The two of them make a bet that whoever kills the most bad guys has to get a massage from the loser. It is revealed that Harley and Red Tool have been waiting, in a freight, for a group of traffickers. The two burst out of their hiding place and start mowing the bad guys down.
Appearing in "Birthday Blues"
- Mad Hatter
- Captain Boomerang
- March Hare
- Killer Croc
- Tweedledee and Tweedledum
- Walrus (First appearance)
- Batman (Flashback only)
- Robin (Flashback only)
- Batgirl (Flashback only)
- Sharon Quinzel (Flashback only)
- Nick Quinzel (Mentioned only)
- Barry Quinzel (Flashback only)
- Frankie Quinzel (Flashback only)
- Ezzie Quinzel (Flashback only)
Synopsis for "Birthday Blues"
Joker rides down the street in a limousine, calling all of Gotham's villains, telling them that "it is going down tonight, at Warehouse 9". Meanwhile, Harley is at the store picking out a birthday cake... for herself.
Harley reveals that she has not had the best experience with birthdays. Her father was in prison when she turned five; her brothers made her sweet sixteen a nightmare; and Batman hasn't been helping matters much either. But no matter what, she was always hoping that the next year would be different. Harley had intended to invite Poison Ivy to a celebration that Joker was going to put on for her, when suddenly, Joker backs out in favor of another crime job.
Harley is left alone to celebrate her birthday with her babies, Bud and Lou the Hyenas, when she suddenly receives a call from Joker asking her to bring the spare drills for the safe. Sadly, Harley concedes and does what she is told. But the moment she arrives, she is greeted by Joker and all of her friends with a surprise birthday cake and gifts. Harley is happy beyond her wildest dreams.
Later on, Joker pulls Ivy aside and asks her to give him the antidote for the poison that she injected him with, now that he has done her bidding and thrown Harley a surprise party. Ivy tells him that he will receive it after Harley is finished opening her presents.
Appearing in "Somewhere That's Green"
- Mother Nature
Synopsis for "Somewhere That's Green"
As Harley and Ivy prepare for Hurricane Jenny to hit New York, they are paid and unexpected visit by Swamp Thing. He asks for Ivy's help in negotiating with Mother Nature to stop her from wiping out the city. Ivy agrees but her powers are not that strong. Swamp Thing allows her to barrow some of his own powers in order to enhance her strength but the process causes Ivy to faint.
While trying to wake Ivy up, Harley accidentally absorbs Swamp Thing's powers, herself. Together, the three of them attempt to put a stop to Hurricane Jenny before it hits the land.
Appearing in "Bird Psychology"
Synopsis for "Bird Psychology"
Joker makes a plan to put the entire city of Gotham to sleep for 48 hours and, of course, he expects Batman to intervene.
While Batman takes on the Joker's men, he orders Robin to go and deactivate the bomb. Robin objects, saying that he wants to help beat up the bad guys. Nevertheless, he does what Batman says. Harley wants to have a chance to beat up Batman, but Joker orders her to follow Robin and stop him before he can turn off the bomb.
Harley and Robin fight it out and Harley eventually gets the upper hand, dousing Robin with sleeping gas. She then begins to mock Robin by telling him that fighting alongside the Batman is pointless, because Batman doesn't care what happens to him. He's just using Robin as a pawn in order to get the job done. Harley confronts him that the only reason he follows Batman's bidding is just so he can try to redeem himself for the loss of his own family by making Batman proud.
But Harley is surprised that in spite of every bit of verbal abuse that she throws at him, Robin continues to resist and stop the bomb with every ounce of his failing strength. Finally Robin passes out. Suddenly filled with respect and sympathy, Harley deactivates the bomb herself.
Later, after regaining consciousness, Robin is congratulated by Batman and the GCPD for saving the entire city. Commissioner Gordon informs them that the Joker escaped but Harley is being taken into custody. But Harley isn't worried. She believes that sooner of later, the Joker will break her out.
- One of the Birthday Cake design suggestions that Joker rejected in Birthday Blues had Batman and Batgirl from Batman: The Animated Series.
- Another cake design had a character in a trash can which is similar to Oscar the Grouch from Sesame Street.
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