• Air date: 01 Aug '12 80 episodes
      Ben was all set to be a solo hero with his new Omnitrix after Gwen and Kevin left for college, but Grandpa Max teamed him up with a rookie, by-the-book partner. Together they explore a secret alien city, known as Undertown beneath the city of Bellwood. Meanwhile, a mysterious hunter, known as Khyber, sets his sights on Ben! With all new alien heroes to choose from, the fun is just getting started. It's a whole new Omniverse!
  • List of Episodes (80)
    • 1. The More Things Change (1)

      01 Aug '12
      After parting ways with Gwen and Kevin, Ben is assigned a new alien partner named Rook Blanko. Meanwhile, Khyber the Hunstman targets Ben as his next prey.
    • 2. The More Things Change (2)

      22 Sep '12
      Rook and Ben find a mysterious alien city under Bellwood after stopping 3 alien crooks: Liam, Fistina, and Bubble Helmet from blowing up Mr. Baumann's superstore in a protection racket.
    • 3. A Jolt From The Past

      29 Sep '12
      The Megawhatts that Ben fought in his youth seek his help when they are being used as a power source for the villain Fistrick.
    • 4. Trouble Helix

      06 Oct '12
      Infiltrating the Plumbers' base, Khyber uploads footage of young Ben's encounter with a corrupted Mechomorph named Malware.
    • 5. Have I Got a Deal for You

      13 Oct '12
      Sunder returns.
    • 6. It Was Them

      20 Oct '12
      Ben and Rook attempt to stop Dr Animo and his giant ants.
    • 7. So Long, and Thanks for All the Smoothies?

      27 Oct '12
      When Ben and Rook investigate a mysterious alien ghost ship, they discover that Argit and the Vreedle Brothers are fighting for possession of a doomsday device.
    • 8. Hot Stretch

      03 Nov '12
      Ben and Rook come across elastic, hot blooded aliens that plan to activate a volcano with a nuclear bomb engine.
    • 9. Of Predators and Prey (1)

      10 Nov '12
      It is revealed that during a fight with Eleven-Year Old Ben Tennyson, Malware touched the Omnitrix symbol on Four Arms. After the battle, he went to Dr. Psychobos and made him create a prototype Omnitrix, the Nemetrix. Back in the present, after a heated argument, Ben and Rook go their separate ways, giving Khyber his best chance to capture Ben.
    • 10. Of Predators and Prey (2)

      17 Nov '12
      While trapped in Khyber's ship, Khyber tells Ben that he needs different alien DNA to complete the evil incomplete version of the Omnitrix the Nemetrix. He also reveals that Dr.Psychobos assigned him to hunt down various species for DNA to transfer it to the Nemetrix.
    • 11. Outbreak

      24 Nov '12
      The Omnitrix begins to malfunction and goes haywire when Psychobos steals a piece of an Omnitrix core causing Rook to mutate into a half-Gourmand and a half-Revonnahgander after Ben 10 attempts to complete a transformation.
    • 12. Many Happy Returns

      01 Dec '12
      Gwen and Kevin visit Bellwood. Kevin tells Ben that he must hide himself from The Tetramand Princess Looma as she is hunting him as Looma wishes to marry Kevin.
    • 13. Gone Fishin?

      08 Dec '12
      Magister Patelliday is kidnapped by pirates who rob ships and put them in giant glass bottles to sell them. They intend to devour Patelliday. Any attempts at rescue are hard, since they have a Krakken and a robot army.
    • 14. Blukic & Driba go to Mr. Smoothy's

      15 Dec '12
      Ben and Rook must stop Trumbipulor from gaining absolute power while Blukic and Driba set out to find Mr. Smoothy's.
    • 15. Malefactor

      22 Dec '12
      Ben and Rook are attacked by Khyber at a festival.
    • 16. Arrested Development

      05 Jan '13
      Billy Billions turns Ben and Rook into kids again.
    • 17. Bros in Space

      12 Jan '13
      Ben and Rook visit Rook's family while Revohnnah is attacked by an old foe.
    • 18. Ben Again

      19 Jan '13
      When Eon forces young Ben and teenage Ben to switch minds, only the time-traveling Professor Paradox can sort things out and help Ben stop Eon from taking over the timelines.
    • 19. Store 23

      26 Jan '13
      Ben meets an alternate version of himself while searching for a 23rd Mr. Smoothy's store.
    • 20. Special Delivery

      02 Feb '13
      As payment for destroying his car, Mr. Baumann orders Ben to make deliveries for him without using the Omnitrix.
    • 21. Showdown (1)

      09 Feb '13
      The Faction infiltrates Galvan Prime on the orders of Malware.
    • 22. Showdown (2)

      16 Feb '13
      Ben must deal with a past failure; a deranged Malware launches his final attack in order to obtain the immeasurable energy and power of the Omnitrix and eliminate Ben once and for all.
    • 23. Tummy Trouble

      23 Feb '13
      The Gourmand queen is captured, forcing Ben and Rook to rally her feuding subjects to save her.
    • 24. Vilgax Must Croak

      02 Mar '13
      Ben and Rook escort Vilgax to a maximum-security prison planet, but the Incurseans have other plans.
    • 25. While You Were Away

      09 Mar '13
      Princess Attea springs Dr. Psychobos from prison to help her lead an invasion of Revonnah.