الموسم 4، الحلقة 15: After learning that Jason and Lex are in China secretly searching for one of the mysterious kryptonian crystals, Clark and Lana follow to confront them. Clark locates the crystal but must battle Isabelle the witch, who has once again inhabited Lana's body in order to take the crystal for herself. Meanwhile, Lionel has more information on the crystals than he is letting on.