Ep 15. Primus

After defeating the Highbreed and their leader, the team reunites back on Earth. However, Ben has been experiencing nightmares about a mysterious entity called "Primus" and is compelled to seek out answers. With the help of Azmuth, the creator of the Omnitrix, the team heads off to an abandoned laboratory where they find a portal leading to Primus.

Upon arriving, they discover a world filled with towering ancient structures and a temple dedicated to Primus. As they make their way to the temple, they are ambushed by a group of savage creatures sent by the enemy Vilgax as well as other enemies.

After a fierce battle, the group manages to make it to the temple and meets the ancient entity known as "Primus." Primus reveals that it is the source of all life in the universe and that its power was split into two halves, half of its power forming the Omnitrix and half of its power remaining on Primus.

Primus also reveals that Vilgax is attempting to use the power of the Omnitrix to merge with the Primus power on Primus, ultimately making him the most powerful being in the galaxy. With the help of Primus, the team must stop Vilgax's plan and prevent the destruction of the universe.

As the team navigates the challenges of Primus, they encounter new and powerful alien foes, forcing Ben to use his all-new alien forms and work with his friends to defeat the evil Vilgax and his army of minions.

With the future of the universe at stake, Ben and his team must use their skills and determination to protect all that they hold dear and prevent the ultimate destruction of everything. The episode is a thrilling conclusion to the Primus saga and a testament to the power of good and the strength of teamwork.