Ben Tennyson is your ordinary kid. As his summer marks the end of fourth grade, he joins up with his Grandpa Max and his cousin, Gwen, to spend the whole summer traveling the nation. During the trip, he discovers a device known as the Omnitrix. With it, he learns that he can transform into ten different alien heroes. Along the way, he learns how to act responsibly, and to be himself.
Ben 10™ (2005)
When 10-year-old Ben Tennyson discovers a mysterious device, he gains the power to change into 10 different alien heroes, each with uniquely awesome powers. With such abilities at his disposal, Ben realizes a great responsibility to help others and stop evildoers, but that doesn't mean he's above a little superpowered mischief now and then.
Ben 10: Alien Force™ (2008)
15-year-old Ben Tennyson decides to return the Omnitrix on his wrist to stop the evil DNALIENS from invading the planet! At the same time, he finds that Grandpa Max is missing. Teamed up with his cousin, Gwen, and his former archenemy, Kevin, they embark on a quest to save the world from the DNAliens and the Highbreed.