Ten-year-old Ben Tennyson, his ten-year-old first cousin Gwen, & their paternal Grandpa Max start a summer camping trip across the United States. Ben & Gwen don't like each other's company and start fighting from the moment they set off. Upon examining it, he discovers it is an alien cargo pod housing a mysterious, watch-like device called the Omnitrix. Even face every villains including Vilgax.