A space villain named Vilgax double-crosses Aledo after getting Ben 10's Omnitrix. That's where the game begins, and it takes you to an alternate universe where you can choose to save the world or dominate it. The choice is yours, but you'll have to jump through plenty of hoops no matter which of the decisions that you make. This game has all the characters you love, and they also have the same characteristics as they do in the cartoon.