Cartoon Network - BEN 10

While on summer vacation with his cousin, Gwen, and their grandfather, Max, Ben Tennyson discovers the Omnitrix; an alien device which allows him to turn into different extraterrestrial life forms. This leads to Ben using the device to avert disasters, save people, and fight off hostile villains and aliens that include Vilgax, an alien warlord bent on using the Omnitrix to outfit an alien army.