Ben Tennyson

Benjamin Kirby "Ben" Tennyson is known as Ben or Ben 10 or sometimes his villains call him Tennyson. He is the main character in all four series: Ben 10 A New Beginning,  Unnamed Ben 10 Alien Force Series, and Unnamed Ben 10 Ultimate Alien series and  Ben 10 Alien Unleashed.

Ben was introduced in the episode and then there were 10. He finds the omnitrix and learns how to use it to become a true hero.

Aliens

 * Super Omnitrix