Memory Blank

S2 E1: Danny and Sam get into a fight, and when Sam utters the words, "I sometimes wish I'd never met you," she finds herself in a world in which she and Danny are strangers. Worse than that, since it was Sam who encouraged Danny to check out the Fenton Portal the night he got his ghost powers, Danny doesn't have any powers! This is good news for Desiree, who granted Sam's wish and plans to gain ultimate power by granting everyone's wishes beneath a shower of shooting stars.