Benjamin Kirby "Ben" Tennyson, also known as Ben 10, is the main protagonist of the series Ben 10. he unintentionally gets a powerful watch-like alien device, the Omnitrix, which latches onto his wrist, giving him the incredible power and ability to transform into ten (later more) super-powered aliens. Unable to remove or destroy it, he uses his new powers and abilities to become a superhero, dealing with both aliens and earth threats, while trying to escape the alien warlord Vilgax, who pursue him relentlessly in order to retrieve the Omnitrix.