And Then There Were 10

Ben Tennyson, a 10-year-old boy from the city of Bellwood, begins his cross-country summer vacation with his cousin, Gwen, and his grandfather, Max. Ben finds a crashed pod at their first stop. Within it is a watch-like alien artifact called the Omnitrix. When he reaches to touch it, the watch latches onto his wrist and refuses to come off, unwillingly merging with his DNA. Ben accidentally discovers that the watch can change his form into various alien creatures and quickly learns how to use it. Deciding that he could be a superhero who can actually help people, Ben uses the watch to destroy robots sent by Vilgax to retrieve it, thus beginning a summer of adventure for himself, Max and Gwen.