Every season of Ben 10: Ultimate Alien ever, ranked from best to worst by thousands of votes from fans of the show. The best seasons of Ben 10: Ultimate Alien!

Ben's secret is out. As Ben deals with his newfound fame, a new threat emerges as a thief steals parts of a new advanced spaceship from NASA.

Fame

Ben is supposed to attend a tournament to support his girlfriend, but the Forever Knights are trying to break into a museum. Ben tries to use the Ultimatrix to handle all his obligations.

Duped

After Jimmy Jones reveals Ben's identity, some of his enemies (such as Zombozo, Rojo, Charmcaster, Vulkanus, and Sevenseven) team up to try to attack his family. Now Ben and his friends have to protect them no matter what.

Hit 'Em Where They Live

Ben gets an offer to star in his own video game, but the designer's real motives are part of a plan to destroy Ben.

Video Games

The team encounters another alien who escaped from Aggregor and, through him, learns more about Aggregor's goals.

Escape from Aggregor

P'Andor, escaped from Aggregor, now wants help to escape his encapsulating suit, but Kevin's the first to perceive that that's a fatally bad idea.

Too Hot to Handle

Then team encounters another of Aggregor's escaped prisoners, Andreas, whom Argit is using as part of a scheme against the Forever Knights.

Andreas' Fault

Ra'ad, the last of Aggregor's escaped prisoners, attacks Ben and informs the team of the true fate of his comrades. He finds a safe hiding place but one that endangers Ben in the process.

Fused

Ben meets his hero, Captain Nemesis, who's become jealous of all the attention Ben attracts.

Hero Time

Aggregor has all five aliens. The Plumbers manage to disable Aggregor's ship, forcing Aggregor to find a new way to absorb their powers. The team makes a last ditch effort to save the alien prisoners.

Ultimate Aggregor

Aggregor has absorbed all the powers of his captured aliens. Now he's after the Map of Infinity.

Map of Infinity

Cash and JT convince the team to allow them to take credit for the team's actions so they can earn money for Cash's mother's operation.

Reflected Glory

Aggregor is after the next piece of the map on a watery planet.

Deep

Aggregor escapes to a magical dimension. Gwen asks for Charmcaster's help to pursue him. The team learns about Charmcaster's past and why she's willing to help them now.

Where the Magic Happens

With the fourth piece of the Map of Infinity almost in Aggregor's clutches, the gang chase him through the artificial planetoid known as Perplexahedron.

Perplexhahedron

As the team makes its final attempt to stop Aggregor, they find an unexpected ally, and one person will make a fateful decision with lasting repercussions.

The Forge of Creation

Kevin's out for payback on anyone who has ever crossed him. His next stop is a prison in the Null Void. Ben and Gwen try to stop him, where Ben comes to a grim decision.

Nor Iron Bars a Cage

Argit asks Ben and Gwen for protection from Kevin, so they take him to the nearest Plumbers Academy, but that won't stop Kevin.

The Enemy of My Enemy

Kevin starts going after Plumbers kids to gain more power. Ben and Gwen continue to argue about how to handle the situation. Gwen tries to find someone who will help her cure Kevin.

Absolute Power (1)

Final confrontation with Kevin. While Gwen makes a last ditch effort to save Kevin, Ben fights an all out battle with Kevin.

Absolute Power (2)

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.

The Transmogrification of Eunice

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.

Eye of the Beholder

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.

Viktor: The Spoils

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.

The Big Story

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.

Girl Trouble

Victor Validus resurfaces and attacks Ben at night. Elena Validus and the nanochips return.

Revenge of the Swarm

The Forever Knights unleash an evil force mistaken for an ancient weapon.

The Creature from Beyond

Ben, Gwen, and Kevin are summoned to a Plumbers' Academy to go under training that is supervised by Magister Hulka.

Basic Training

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.

It's Not Easy Being Gwen

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.

Ben 10,000 Returns

Grandpa Max tells the team about his first UFO encounter, which led him to meet Verdona.

Moon Struck

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.

Prisoner #775 Is Missing

Old George, the original Forever Knight, reclaims his position, and orders the Knights to remove all aliens on Earth.

The Purge

Simian asks the team for help when a DNAlien takes over his home world.

Simian Says

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.

Greetings from Techadon

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.

The Flame Keeper's Circle

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.

Double or Nothing

Julie suddenly leaves a tennis tournament and spends all her time with Ben.

The Perfect Girlfriend

Ben's Ultimate transformations have developed their own personalities. Now they want their freedom from Ben.

The Ultimate Sacrifice

Colonel Rozum asks the team to investigate an island of garbage where people have been disappearing.

The Widening Gyre

Ma Vreedle goes to Earth to expand her family by creating clones and using all the water on Earth.

The Mother of All Vreedles

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.

A Knight to Remember

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.

Solitary Alignment

A Techadon weapon master comes to Earth and wants the Ultimatrix.

Inspector #13

Gwen and co revisit Legerdomain in hopes of rescuing Charmcaster.

The Enemy of My Frenemy

After Darkstar opens the Door to Anywhere, Charmcaster comes through, and the two team up to give Ben, Gwen, and Kevin the fight of a lifetime.

Couples Retreat

Movie starlet Jennifer Nocturne is recaptured by the evil Captain Nemesis!

Catch a Falling Star

Dr. Animo is unexpectedly paroled from prison and starts up a company selling eggs, which in fact contain mutant dinosaurs which he wishes to distribute around the world.

The Eggman Cometh

Albedo attempts to get the ultimatrix by invading Ben's mind.

Night of the Living Nightmare

The final battle between the Forever Knights and Dagon's Esoterica is in full swing, with Ben caught in the middle!

The Beginning of the End

Dagon is getting closer and closer to entering our dimension thanks to an old foe.

The Ultimate Enemy (1)

Vilgax re-emerges in his most powerful form ever! Can Ben stop him and save the universe?

The Ultimate Enemy (2)

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.

The Best Seasons of Ben 10: Ultimate Alien

The Best Seasons of Ben 10: Ultimate Alien

Season 2

Season 1