E1 - The Transmogrification of Eunice

Aired: February 04, 2011

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.

E2 - Eye of the Beholder

Aired: February 11, 2011

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.

E3 - Viktor: The Spoils

Aired: February 18, 2011

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.

E4 - The Big Story

Aired: March 04, 2011

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.

E5 - Girl Trouble

Aired: March 11, 2011

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.

E6 - Revenge of the Swarm

Aired: March 18, 2011

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

E7 - The Creature from Beyond

Aired: March 25, 2011

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

E8 - Basic Training

Aired: April 01, 2011

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

E9 - It's Not Easy Being Gwen

Aired: April 08, 2011

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.

E10 - Ben 10,000 Returns

Aired: April 15, 2011

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.

E11 - Moon Struck

Aired: April 22, 2011

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

E12 - Prisoner #775 Is Missing

Aired: April 29, 2011

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.

E13 - The Purge

Aired: September 16, 2011

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

E14 - Simian Says

Aired: September 23, 2011

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

E15 - Greetings from Techadon

Aired: September 30, 2011

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.

E16 - The Flame Keeper's Circle

Aired: October 07, 2011

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.

E17 - Double or Nothing

Aired: October 14, 2011

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.

E18 - The Perfect Girlfriend

Aired: October 21, 2011

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

E19 - The Ultimate Sacrifice

Aired: October 28, 2011

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

E20 - The Widening Gyre

Aired: November 04, 2011

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

E21 - The Mother of All Vreedles

Aired: November 18, 2011

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

E22 - A Knight to Remember

Aired: December 02, 2011

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.

E23 - Solitary Alignment

Aired: December 09, 2011

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.

E24 - Inspector #13

Aired: February 04, 2012

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

E25 - The Enemy of My Frenemy

Aired: February 11, 2012

Gwen and co revisit Legerdomain in hopes of rescuing Charmcaster.

E26 - Couples Retreat

Aired: February 18, 2012

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.

E27 - Catch a Falling Star

Aired: February 25, 2012

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

E28 - The Eggman Cometh

Aired: March 03, 2012

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.

E29 - Night of the Living Nightmare

Aired: March 10, 2012

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

E30 - The Beginning of the End

Aired: March 17, 2012

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

E31 - The Ultimate Enemy (1)

Aired: March 24, 2012

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

E32 - The Ultimate Enemy (2)

Aired: March 31, 2012

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