With his secret identity now revealed to the world, Ben Tennyson continues to fight evil as a superhero with the help of the newly acquired Ultimatrix.
A mysterious alien girl named Eunice has no memory and is being hunted by Sunder. While evading Sunder, Ben soon discovers that Eunice has nature-based abilities.
Ben, Julie and the rest of the heroic crew embark on a dangerous journey that could cost them all their lives in an effort to achieve the safe return of Ship and his former owner Baz-L.
The King of Zarkovia asks the team for help with a civil war. The team agrees to help when they find out Dr. Viktor may be involved.
Jimmy Jones is looking for the biggest new story he and Ben can tackle, but thats when he stumbles upon a strange pink tentacled creature which crashed from the sky into a near by cave.
Gwen is excited by the prospect of her cousin Sunny paying the team a visit while dealing with the Robots of Dimension 12. But her excitement quickly turns into trepidation when it is uncovered that her cousin is not all that she appears and has some particularly sinister intentions.
Victor Validus resurfaces and attacks Ben at night. Elena Validus and the nanochips return.
The Forever Knights unleash an evil force mistaken for an ancient weapon.
Ben, Gwen, and Kevin are summoned to a Plumbers' Academy to go under training that is supervised by Magister Hulka.
Gwen has always been a multi-tasker, trying to juggle school, hobbies, friends and her work as a hero, waking up early and going to sleep late. But Gwen's already packed day is about to get worse when Dr. Animo attacks with an army of giant frogs and Gwen is forced to make a hard choice.
Following a visit from Paradox after a fight with Eon, Ben 10,000 arrives 20 years from the future to seek the aid of his past counterpart in tracking down Eon.
Grandpa Max tells the team about his first UFO encounter, which led him to meet Verdona.
After a base is attacked, Max is infuriated when they learn it was a secret alien prison facility. While Max argues with the officer in charge, the team tries to locate an escaped prisoner.
Old George, the original Forever Knight, reclaims his position, and orders the Knights to remove all aliens on Earth.
Simian asks the team for help when a DNAlien takes over his home world.
Ben faces Tecadon killer robots that have been programmed to kill him. Each robot is more powerful than the last one. Ben's only chance to survive is for Gwen to find out who commissioned the robots.
Julie gets Ben to visit a charity organization who wants to improve the world with alien technology. Ben soon discovers the charity's benefactor is an old enemy.
Ben finds out there's a new show called 'Ben 10: Live." He finds an old enemy running the show and cashing in on his fame.
Julie suddenly leaves a tennis tournament and spends all her time with Ben.
Ben's Ultimate transformations have developed their own personalities. Now they want their freedom from Ben.
Colonel Rozum asks the team to investigate an island of garbage where people have been disappearing.
Ma Vreedle goes to Earth to expand her family by creating clones and using all the water on Earth.
The Flame Keepers realize their mistake too late. Vilgax wants the power of Daigon. The Forever Knights are out to destroy Daigon. Ben and the team try to sort things out.
Azmuth reveals the origin of the sword and how he first encountered Old George. Ben comes to a decision on how to handle the Daigon.
A Techadon weapon master comes to Earth and wants the Ultimatrix.
Gwen and co revisit Legerdomain in hopes of rescuing Charmcaster.
Charmcaster and Darkstar team up to destroy Ben, Gwen and Kevin.
Movie starlet Jennifer Nocturne is recaptured by the evil Captain Nemesis!
Dr. Animo returns!
Albedo attempts to get the ultimatrix by invading Ben's mind.
The final battle between the Forever Knights and Dagon's Esoterica is in full swing, with Ben caught in the middle!
The Forever Knights battle Diagon's Esoterica, and Ben's plan to help the knights fails.
After defeating Vilgax, Ben battles Dagon in his True Form as Ultimate Way Big.