Ben 10 Alien Force Story Book: Ben's Knightmare

Ben Tennyson is a typical teenage boy who happens to be able to turn into ten different aliens. It's all thanks to the Omnitrix, an alien wristwatch that gives Ben amazing superpowers. Together with his cousin Gwen and his former nemesis, Kevin, Ben must fight the fearsome HighBreed, a powerful alien race determined to destroy all intelligent life in the galaxy -- starting with Earth.