The original series that started it all. Follow 10-year-old Ben Tennyson as he discovers the Omnitrix, a powerful device that allows him to transform into various alien heroes. Join Ben, his cousin Gwen, and their Grandpa Max on thrilling adventures to save the world from evil forces. The majority of the show focuses on individual adventures during the family's cross-country Summer vacation. During their vacation, the Tennysons encounter various enemies ranging from space aliens to supernatural entities.