It's Hero Time.
Ben Tennyson was an average ten-year-old kid on an uneventful summer road trip with his Grandpa Max and Cousin Gwen. That is, till he discovers a strange alien wristwatch called the omnitrix buried in a crashed meteorite. Now, with the omnitrix, Ben can transform into any of 10 alien heroes - each with their own special powers. And Ben is going to need all the powers he can get if he is going to save the world - from Vilgax and his evil alien f-rces.