Ep 23. Sentries of the Last Cosmos

In Batman Beyond season 2 episode 23, titled "Sentries of the Last Cosmos," Terry McGinnis, the new Batman, finds himself facing a difficult challenge as he tries to stop an alien invasion from destroying the planet. The episode begins with the sudden appearance of a group of alien spacecraft headed towards Earth. The Justice League has already been called to action, but they are unable to communicate with the alien ships and can't seem to stop them from advancing.

Meanwhile, Terry is dealing with personal problems, as his relationship with his girlfriend Dana is on the rocks. While he's out on patrol one evening, he comes across a strange signal that he's never seen before. He decides to investigate and finds an old spaceship buried beneath the city. Inside, he discovers a group of beings known as the Sentries, who are the last survivors of their race. They have been in hibernation for thousands of years, waiting for someone to awaken them when the time is right.

The Sentries tell Terry that they were once part of a great army that protected the universe from evil, but they were betrayed by one of their own. The traitor, known as Krull, stole a powerful artifact known as the Star-Core and used it to gain ultimate power. The Sentries were unable to stop him and were forced to retreat to their ship, where they have been sleeping ever since.

Krull has resurfaced on Earth and is using the Star-Core to power the invading alien fleet. The Sentries are the only ones who know how to stop Krull and save the planet, so Terry teams up with them to take down the villain. Together, they infiltrate Krull's base and engage in a fierce battle.

Not only must Terry face Krull and his army of minions, but he must also deal with his own doubts about his ability to save the world. The Sentries provide encouragement and guidance, helping Terry summon the strength and courage he needs to defeat Krull.

In the end, Terry emerges victorious, but not without sacrificing something important. The experience solidifies Terry's commitment to his role as successor to Batman and helps him find the strength to repair the rift with Dana. The episode ends on a hopeful note, as Terry gazes up at the stars, reminded of the infinite possibilities that await him and his future adventures as the Dark Knight.

Overall, "Sentries of the Last Cosmos" is a thrilling, action-packed episode of Batman Beyond that explores themes of courage, sacrifice and the power of friendship. It's a must-see for fans of the show and serves as a satisfying conclusion to the second season.