Rent Ben 10 (2005 - 2007)

Ben 10 is an american animation about a young 10 year old boy who finds a special kind of wristwatch called the Omnitrix. With this watch he gains the power to turn into many different types of alien creature, only by wearing it on his wrist. With it he goes on adventures with his cousin Gwen and his grandfather Max as they travel the country battling aliens and other villains who cross their paths as they have a very interesting yet dangerous vacation.