Washington B.C.

S1, E2: Average kid, ten year old Ben Tennyson, his Grandpa Max and his Cousin Gwen's summer of adventure takes an odd turn when Ben discovers a watch like object (the Omintrix Prototype) that has been jettisoned from alien spacecraft high above the earth. When the prototype attaches itself to Ben's wrist, he discovers that it allows him to become any one of Ten Aliens. Ben's first test as a hero comes early as Vilgax (Season #1's main villain) sends Mecharoids to procure the prototype.