Thanks Ben 10 Wiki for this info
Benjamin Kirby Tennyson-Ryan Kelley
He is first introduced in the pilot episode And Then There Were 10, where he finds the Omnitrix and then, throughout the series, learns to use the powerful alien device, including the responsibility of wielding it, to become a true hero.
Hey if it's not broke don't fix it
Gwendolyn Tennyson-Galadriel Stineman
No pic of the Actor
Nathan Keyes- Kevin Ethan Levin/Voice of Ultimate Kevin
No pic of Actor (can't find one :()
James Earl Jones- Voice of Vilgax
Psyphon-Mark Hamil
Christopher Lee-Voice of Techadon Robot
And Dee Bradley Baker-Voice of Swampfire/Ultimate Swampfire/ Every Other Alien
Jhon DiMaggio-Rath
See ya