Ep 1. Ultimate Aggregor

Ben 10: Ultimate Alien season 2 episode 1 is titled "Ultimate Aggregor". Following the events of the previous season, when Ben 10 unlocked the full power of the Omnitrix, our hero is now facing a new villain who is on a quest to obtain the powers of all five aliens that Ben had unlocked to become Ultimate versions of them.

The episode starts with Ben, Gwen and Kevin following an alien signal that leads them to a spacecraft hovering over a mountain range. The ship is the property of the mysterious villain named Aggregor, who had been previously seen collecting the powers of other aliens. Ben and his friends attempt to board the ship, but they are stopped by a powerful force field.

Using his new teleportation ability, Ben sneaks on board and discovers that Aggregor is holding five alien prisoners, whose powers he intends to use to become the most powerful being in the universe. Aggregor has already acquired four of the five aliens, leaving only the fifth and final one to complete his collection. After conducting some research, Ben learns that the missing alien is located on a nearby planet, and the trio set out to retrieve it before Aggregor does.

Upon arriving on the planet, Ben and his friends discover that there is an intense civil war taking place between the inhabitants. The locals are being ruled by a cruel dictator who has enslaved the fifth alien, known as Bivalvan. They also learn that there is a resistance group fighting against the tyranny of the dictator. Without any hesitation, our heroes decide to join the resistance movement and free Bivalvan.

However, things don't go as planned when Aggregor shows up on the planet, using his powers to destroy everything in his path to capture Bivalvan. Ben and his friends work together with the resistance group to fend off his attacks while trying to rescue Bivalvan. Ben attempts to transform into the Ultimate version of his alien form, but he is stopped by a strange energy field. Aggregor reveals that he has created a weapon that can suppress the Ultimatrix's powers, leaving Ben powerless to stop him.

As the battle intensifies, Aggregor finally manages to capture Bivalvan and obtain the final alien power he needs to complete his collection. Our heroes are left devastated, as they feel responsible for not being able to save Bivalvan and prevent Aggregor from gaining ultimate power. The episode ends with Aggregor escaping on his spacecraft, leaving our heroes in a state of shock, questioning how they can prevent him from destroying the universe with his newfound powers.

In summary, Ben 10: Ultimate Alien season 2 episode 1, titled "Ultimate Aggregor", takes us on a thrilling ride as we witness Ben and his friends battling a powerful villain on a quest to become the most powerful being in the universe. This episode sets up the series for a high-stakes battle between the heroes and the villain, highlighting the importance of teamwork and courage in the face of danger. Fans of the show will surely be left on the edge of their seats, eagerly anticipating what happens next in the ongoing saga.