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|Base of operations||Bellwood (mentioned)|
|Abilities||Alien gauntlet technology that grants the ability to transform into various aliens that possess a wide variety of abilities|
|Weapons|| ·Omnitrix (formerly)|
|Relatives|| Gwen Tennyson (cousin)|
|Allies||Kevin Levin, Rex Salazar, White Knight, Gwen Tennyson, Max Tennyson|
|Enemies||Alpha, Biowulf, Skalamander, I-Bol|
|First appearance||"Ben 10/Generator Rex: Heroes United" (only appearance)|
|Portrayed by:||Yuri Lowenthal|
|Images | Quotes|
|“||I'm Ben Tennyson. Ben 10. Like, the biggest hero in the world?||”|
Ben is a living legend in his universe due to his use of the powerful Omnitrix/Ultimatrix. When he was ten years of age he found the Omnitrix, a watch filled with alien DNA which had fallen from space. He, his friend, Kevin, and cousin, Gwen, are part of a group called the Plumbers.
When Ben first arrived in Rex's universe, they both got into a brawl as Ben mistook Rex for an alien while Rex mistook him for an EVO. Ben was eventually captured by the Providence Defect Group, but he escaped, trying to find a way back home. Once he finally realized that there was no way back he gave up and decided to assist Rex in his time of need. At this point, Ben met Caesar, who had come to save them both from Alpha, a dangerous creation made by Caesar six years ago during the Nanite Project.
After Alpha turned hostile, Ben used Cannonbolt to escape with Rex from Alpha. The two went back to The Plant where they played basketball and explained their origins. However, Alpha attacked the EVO containment to absorb the nanites from the present EVOs, including Rex. Ben helped save Rex from Alpha, causing him to flee.
Ben wields the power of the Ultimatrix — a powerful alien watch that resembles a gauntlet. The Ultimatrix grants him the ability to change into various extraterrestrial lifeforms, thus granting him a wide variety of powers and abilities. It also allows him to "evolve" his aliens into their ultimate forms.
- Please note that these are only the aliens seen in "Heroes United".
- 310-311. "Ben 10/Generator Rex: Heroes United"
- Action Pack #65. "Hero Times Two"
- Rex once asked if Ben is one of the "glass half-full guys", implying that Ben is an optimist.
- In the Ben 10 series, Ben usually calls out the name of the alien he transforms into, but he does not do this in "Heroes United".
- Ben obtained some of Rex's nanites when Rex tried to 'cure' him as Diamondhead and Rath, therefore making him the only person in his world with nanites and liable to go EVO.
- However it should be noted that Alpha removed Ben's nanites when he copied the Ultimatrix.
- Ben is the third character intended to be 'cured' by Rex and being failed to do so due to not being an EVO, the others being the Chupacabra and the Tyrannosaurus Rex.
- Diamondhead's ability of crystals/diamonds are very similar to the powers of Skalamander.
- For more information on Ben Tennyson, see the article on Ben 10 Planet.
- For more information on Ben Tennyson's Ultimatrix, see this article on Ben 10 Planet.