Ep 21. Wild Card: Part 1

In Justice League Unlimited season 2 episode 21, titled "Wild Card: Part 1," the team faces a new villainous threat in the form of the Joker. The episode opens with the Joker breaking into a top-secret government facility with the help of his girlfriend, Harley Quinn. He manages to steal a powerful weapon called the Royal Flush Gang's technology, which gives him the ability to control all aspects of luck.

Meanwhile, the Justice League is dealing with internal issues as they try to determine who will take over the leadership role now that the founding members are no longer active. The Flash suggests that they bring on new members to the team, which leads to the introduction of several new heroes, including Green Arrow, Black Canary, and Crimson Avenger.

As the League tries to navigate these changes, they are confronted with the Joker's threat to Las Vegas. He plans to use his newly acquired powers to rig the odds and win big at every casino, effectively bankrupting the city. The League splits up to try and stop him, but the Joker proves to be a formidable opponent.

The Joker's rampage leads to several intense confrontations, including a showdown with Batman, who has a personal vendetta against the clown prince of crime. The two engage in a brutal battle that reveals a surprising twist about the Joker's true intentions.

As the episode ends, the League is left reeling from the conflict and uncertain about how to move forward. The stage is set for the second part of the episode, which promises even more action and intrigue as the Joker's plan unfolds.