The second last installment of Alien Force!
Ben, Gwen and Kevin run into trouble when they find an alien box called the Naljian Destructor that can copy their powers. Elsewhere, Ben is asked to escort a Luoadan Prince in an effort towards interspecies peace, however a malfunctioning Omnitrix causes a few problems. The trio are also end up on a planet called Primus where they run into an old ‘friend’: Vilgax!