All three seasons of “Ben 10 Alien Force” are available on Amazon Video for purchase, as of 2015. Each episode costs $2.99, and an entire season can be viewed for $24.99.
“Ben 10 Alien Force” is a children’s animated series about 15-year-old Ben Tennyson, a young man with the ability to transform into different alien forms with the power of his Omnitrix watch. Ben and his cousin Gwen are searching the galaxy for their missing grandfather and must battle menacing alien threats along the way.
“Ben 10 Alien Force” takes place 5 years after its prequel series “Ben 10.” Both shows premiered on Cartoon Network.