Benjamin (Ben) Tennyson, his cousin Gwen, and their grandfather Maxwell start their summer camping trip. Ben goes stomping off into the woods after another fight with Gwen, whom he is not happy to have along on the trip, and finds an alien pod on the ground. When he examines it, he finds a mysterious, watch-like device, called the Omnitrix, stored inside. The device attaches permanently to his wrist and gives him the ability to transform into a variety of alien life-forms, each with their own unique powers, quite similar to DC Comics' Dial H for Hero comic. Although Ben realizes that he has a responsibility to help others with these new abilities at his disposal, he is not above a little superpowered mischief now and then. Along with Gwen and Max, Ben fights evil, both extraterrestrial and benl.