Seasons & episodes
S2 · E1The Transmogrification of Eunice 2011-02-04 · 23 min
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.
S2 · E2Eye of the Beholder 2011-02-11 · 23 min
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.
S2 · E3Viktor: The Spoils 2011-02-18 · 23 min
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.
S2 · E4The Big Story 2011-03-04 · 23 min
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.
S2 · E5Girl Trouble 2011-03-11 · 23 min
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.
S2 · E6Revenge of the Swarm 2011-03-18 · 23 min
Victor Validus resurfaces and attacks Ben at night. Elena Validus and the nanochips return.
S2 · E7The Creature from Beyond 2011-03-25 · 23 min
The Forever Knights unleash an evil force mistaken for an ancient weapon.
S2 · E8Basic Training 2011-04-01 · 23 min
Ben, Gwen, and Kevin are summoned to a Plumbers' Academy to go under training that is supervised by Magister Hulka.
S2 · E9It's Not Easy Being Gwen 2011-04-08 · 23 min
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.
S2 · E10Ben 10,000 Returns 2011-04-15 · 23 min
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.
S2 · E11Moon Struck 2011-04-22 · 23 min
Grandpa Max tells the team about his first UFO encounter, which led him to meet Verdona.
S2 · E12Prisoner #775 Is Missing 2011-04-29 · 23 min
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.
S2 · E13The Purge 2011-09-16 · 23 min
Old George, the original Forever Knight, reclaims his position, and orders the Knights to remove all aliens on Earth.
S2 · E14Simian Says 2011-09-23 · 23 min
Simian asks the team for help when a DNAlien takes over his home world.
S2 · E15Greetings from Techadon 2011-09-30 · 23 min
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.
S2 · E16The Flame Keeper's Circle 2011-10-07 · 23 min
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.
S2 · E17Double or Nothing 2011-10-14 · 23 min
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.
S2 · E18The Perfect Girlfriend 2011-10-21 · 23 min
Julie suddenly leaves a tennis tournament and spends all her time with Ben.
S2 · E19The Ultimate Sacrifice 2011-10-28 · 23 min
Ben's Ultimate transformations have developed their own personalities. Now they want their freedom from Ben.
S2 · E20The Widening Gyre 2011-11-04 · 23 min
Colonel Rozum asks the team to investigate an island of garbage where people have been disappearing.
S2 · E21The Mother of All Vreedles 2011-11-18 · 23 min
Ma Vreedle goes to Earth to expand her family by creating clones and using all the water on Earth.
S2 · E22A Knight to Remember 2011-12-02 · 23 min
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.
S2 · E23Solitary Alignment 2011-12-09 · 23 min
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.
S2 · E24Inspector #13 2012-02-04 · 23 min
A Techadon weapon master comes to Earth and wants the Ultimatrix.