Ben Tennyson was just an average 10-year-old kid - until he discovered a strange alien watch in a crashed meteorite. Called the Omnitrix, this watch gives Ben the ability to transform into any of 10 alien heroes, all the while keeping his 10-year-old personality. Episodes: Perfect Day, Divided We Stand, Don't Drink The Water, Big Fat Alien Wedding, Ben Four Good Buddy, Ready To Rumble, Ken Ten, Goodbye and Good Riddance, "Ben 10 Vs. The Negative Ten" Part I, "Ben 10 Vs. The Negative Ten" Part II.