Ep 12. The Once and Future Thing, Part One

The show Justice League Unlimited is an animated series that follows the adventures of the world's greatest superheroes. In season 1 episode 12, called The Once and Future Thing, Part One, the Justice League has to deal with a time-traveling villain who threatens to destroy all of history.

The episode begins with The Flash racing towards the Justice League headquarters, where he conveys a warning from future Justice League members that a dangerous time traveler has arrived in present-day Gotham City. Batman and Wonder Woman are assigned to track him down and stop him before he changes history. The time traveler turns out to be a sorcerer called Chronos, who is using a time belt to travel through different eras. Chronos is on a mission to erase the Justice League from history, and he plans to do this by altering the timeline at critical moments.

Batman and Wonder Woman head to the Old West, where Chronos has traveled to carry out his first mission. They end up in a town called Cowboy City, where they meet old west versions of themselves. Batman teamed up with the cowboy hero Jonah Hex, while Wonder Woman fought alongside an ally called Bat Lash. They discover that Chronos has traveled back in time to the moment when Jonah Hex is supposed to die, and he plans to change history by saving him.

The Justice League is faced with a tough challenge - they have to figure out how to stop Chronos without causing any paradoxes or altering history themselves. Their first step is to team up with their old west counterparts to prevent Chronos from saving Jonah Hex. From there, they will have to follow Chronos into different time periods and stop him from meddling with history.

The Once and Future Thing, Part One is a thrilling episode that takes the Justice League on a journey through time. The show explores the concept of time travel in a fun and exciting way, while also tackling complex ethical questions about altering history. The episode also offers an intriguing glimpse into the old west world of Cowboy City, where the Justice League meets new heroes and fights new villains. With strong characters, a clever plot, and plenty of action, this episode is a standout installment in the first season of Justice League Unlimited.