Old enemies resurface when Charmcaster works her magic on Kevin and turns him against Ben and Gwen. But the trio pulls it together until Darkstar reappears and leads Kevin on an ancient adventure that leaves them stripped of their powers when Kevin needs his the most. And just when it couldn't get any worse, the Omnitrix malfunctions turning Ben into an angry new alien who will pick a fight with anything that breathes. Watch out for Ben's Rath!