Harley Quinn 25th Anniversary Special #1 (2017)

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.

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.