Ep 3. Inferno

In the third episode of season three of Ben 10 Alien Force, titled "Inferno", Ben, Gwen, and Kevin are thrown into an explosive situation when they investigate a fire at a local natural history museum, only to discover that it was caused by a group of DNAliens stealing Ascalon, the sword of Sir George, which is capable of destroying worlds.

As they follow the trail of the DNAliens, Ben and his team discover that they are working for a mysterious figure known as Dagonet, who is attempting to use Ascalon to open a portal to the Null Void and unleash its power on the Earth. In order to stop him, Ben must not only master the full potential of the Ultimatrix but also confront his biggest fear - losing control of the alien within him.

During the course of their mission, Ben and his team encounter a number of obstacles and allies, including the DNAliens' leader, who is sympathetic to their cause but bound by their loyalty to Dagonet; a young boy who was exposed to the Null Void and has gained powerful telekinetic abilities; and a group of DNAliens who have broken free of their programming and are seeking a way to return to their true forms.

As the stakes continue to rise and the threat of the Null Void looms larger, Ben must learn to trust his instincts and rely on his friends to save the world from destruction. And in doing so, he may just discover that there is more to being a hero than just having extraordinary powers - it also requires courage, compassion, and a willingness to make sacrifices for the greater good.

With its thrilling action, compelling characters, and thought-provoking themes, "Inferno" is a standout episode of Ben 10 Alien Force that showcases the series' remarkable combination of heart, humor, and high-stakes adventure. Whether you're a longtime fan or new to the franchise, it's an episode you won't want to miss.