Omnitrix, Ben 10 Universe Wiki

The Omnitrix is a piece of alien technology designed by Azmuth and built by the combined efforts of him and his assistant Myaxx. It allows the wearer to transform into whatever alien species whose DNA is within its database. It was sent to Earth by Xylene to get it away from Vilgax and it was found by Ben Tennyson. It has 1,000,904 alien DNA samples within it. Azmuth created the Omnitrix with the intention of providing the various species of the universe with a better understanding of each other

Omnitrix, Ben 10 Wiki

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Omnitrix, GrimmFall Wiki

Might be a hot take, but Gwen 10 is my least favorite episode of classic Ben 10. I can't enjoy it because I just feel bad for Ben the whole time.

Brainstem (Omnitrix Unleashed), Ben 10 Fan Fiction Wiki

Xylene, Ben 10 Universe Wiki