Ben 10: Omniverse (story arc 1) facts for kids

Eleven-year-old Ben Tennyson faces off with the red Galvanic Mechamorph, Malware (Corey Burton). Five years later, Kevin and Gwen leave when Gwen takes early enrollment in an Ivy League college, and Kevin moves to be near her. Ben is forced to fight crime alone, but Grandpa Max (Magister Tennyson – the commander of the Earth-base's Plumbers) gives him a new partner, rookie Plumber Rook Blonko (Bumper Robinson). Ben and Rook end up in their first team-up when Mr. Baumann's store is targeted for destruction by three alien criminals (Bubble Helmet, Fistina, and Liam), while an intergalactic hunter named Khyber (David Kaye) watches Ben from the shadows.
Omnitrix alien debuts: Four Arms (11-year-old), Feedback (11-year-old), Lodestar, Spidermonkey, Cannonbolt (16-year-old), Bloxx (16-year-old)
Nemetrix alien debuts: Crabdozer

---

After stopping Bubble Helmet, Fistina, and Liam from destroying Mr. Baumann's store, Ben and Rook discover an underground alien city named Undertown where they discover that Psyphon is behind the protection racket. At the same time, Khyber sends his pet in the form of Buglizard to hunt Ben.
Omnitrix alien debuts: NRG, Water Hazard, Terraspin, Armodrillo, Shocksquatch
Nemetrix alien debuts: Buglizard

The Megawhatts that Ben fought in his youth come back, seeking his help due to them being used as a power source for the villain Fistrick (Eric Bauza), Ben must help Megawhatts to stop, and defeat Fistrick and save the day.

Omnitrix alien debuts: Stinkfly (11-year-old), Heatblast (16-year-old), Clockwork (16-year-old), Gravattack

Infiltrating the Plumbers' base, Khyber downloads footage of young Ben's encounter with a corrupted Mechamorph named Malware. This shows Malware's origins and Ben's first encounter with him when he attacks Galvan Prime.

Omnitrix alien debuts: Chromastone, XLR8 (11-year-old), Heatblast (11-year-old), Cannonbolt (11-year-old), Diamondhead (11-year-old)

Ben meets an alien con artist named Professor Blarney T. Hokestar (Charlie Adler) whose miracle elixir is extracted from a small alien called a Screegit in his lab. When a Florauna activist named Pax (Bauza) convinces Ben to help him free the small alien from Hokestar's lab, chaos ensues when the nitrogen in Earth's atmosphere turns the Screegit into a giant, acid-spitting monster.

Omnitrix alien debuts: AmpFibian, Swampfire, Wildmutt (16-year-old), Jury Rigg, Grey Matter (16-year-old), Nanomech

Dr. Animo (Dwight Schultz) has escaped his Plumber prison, and Ben and Rook must track him down before he transforms the world into a mutant ant farm.

Omnitrix alien debuts: Diamondhead (16-year-old), Echo Echo, Rath, Crashhopper

Nemetrix alien debuts: Slamworm, Mucilator

Argit (Alexander Polinsky) and the Vreedle Brothers (John DiMaggio & Rob Paulsen) are fighting for possession of a doomsday device called the Annihilarg. The device then activates and destroys the universe, but Ben uses Alien X's abilities to recreate the universe, albeit with some minor differences.

Omnitrix alien debuts: Alien X

Ben and Rook come across elastic, hot-blooded aliens that plan to activate a volcano with a nuclear bomb engine. Ben later falls for a female alien named Esther (Tara Platt).

Omnitrix alien debuts: Eatle, XLR8 (16-year-old), Arctiguana

Part 1: In flashbacks, it is revealed that after a fight with 11-year-old Ben, Malware allied with Dr. Psychobos (Bauza) to create a knockoff of the Omnitrix called the Nemetrix to defeat Psychobos's rival Azmuth and prove that Cerebrocrustaceans are smarter than the Galvans. In the present, after a heated argument, Ben and Rook go their separate ways, giving Khyber his best chance to capture Ben. After a long battle, Ben is forcibly changed back into his human form and supposedly falls unconscious.
Omnitrix alien debuts: Stinkfly (16-year-old), Ball Weevil (16-year-old)
Nemetrix alien debuts: Terroranchula

---

Part 2: Khyber tells Ben that he needs different alien DNA to complete the Nemetrix. He also reveals that Dr. Psychobos assigned him to hunt down various species for DNA to transfer it to the Nemetrix and also tells Ben that the reason Dr. Psychobos is creating an evil Omnitrix is because of the orders from Malware. After Ben breaks free, a brawl breaks out leaving Khyber the victor. Rook breaks in and saves Ben and the duo then reveals to Khyber that they orchestrated the whole "fight" at Undertown and Ben only let Khyber capture him so he can lead them to his ship. Ben and Rook accidentally crash Khyber's ship eliminating the DNA to complete the Nemetrix. Khyber and his dog emerge unharmed as Malware and Dr. Psychobos arrive.
Omnitrix alien debuts: Humungousaur, Big Chill (16-year-old)
Nemetrix alien debuts: Tyrannopede