S4, E2: Jeremy creates a polymorphic specter of himself to go to phys ed class in order to be left to work undistracted on bringing William back from Lyoko. Jeremy’s body double turns out to be far more athletic than the original, to Jim’s considerable surprise. But Xana wrests control of the tower Jeremy used to conjure up his clone, and the imposter now poses a serious threat to our heroes. A battle ensues on the now fully reconstructed Lyoko, featuring new, updated gear for the Lyoko Warriors.