In the series finale, The Final Battle, Ben faces Vilgax again in their final battle, destroying the Omnitrix in the process.
In the second season, Vilgax returns as the main antagonist, forcing Ben, Gwen, and Kevin to tackle bigger problems and find out more secrets about the Omnitrix. At the same time, they must enlist the help of the Plumbers' kids (children or grandchildren of retired Plumbers which are commonly half human and half alien) and repel attacks from a new enemy, the Highbreed. His adventures all done, Ben has taken off the Omnitrix and has grown from a young boy into a confident teenager however, the mysterious disappearance of Grandpa Max makes Ben put the Omnitrix back on, as well as forcing him his cousin Gwen and his old enemy Kevin to search and locate Grandpa Max. Five years after the Original Series, 15-year-old Ben Tennyson has returned to a normal, everyday life.
