S1, E5: Ben finds himself hunted down by three alien bounty hunters – the crustacean-like Krabb, the mechanical assassin Sixsix and the mysterious Hoverboard - hired by Vilgax to procure the prototype watch. The experienced and powerful mercenaries provide Ben's alien heroes with their first true challenges. Fortunately, Hoverboard is a double agent working on the side of good to make sure the Omnitrix doesn't wind up in the wrong hands. Unfortunately, he is not too pleased that Ben treats the most powerful weapon in the galaxy as a play toy.