Ben was an average ten-year-old kid, until he found the Omnitrix, a powerful watch-like device that attached to his wrist and allowed him to turn into ten different alien species. Though initially immature and clumsy, he grew as a true hero. By the time he was sixteen, he had become famous in not only his hometown of Bellwood, but on Earth and beyond. Ben has also become a member of the Plumbers, an intergalactic police force that his grandfather, Max, belongs to. Over time, Ben began to access the ability to transform into far more alien species than the original ten.
The original series, which ran from 2005 to 2007, spawned three sequel series: Ben 10 Alien Force, Ben 10 Ultimate Alien, and Ben 10 Omniverse. A reboot of the original series is scheduled to premiere on February 2, 2017.