Wyatt, the son of "Charmed One" Piper (Holly Marie Combs) and Whitelighter Leo (Brian Krause), is kidnapped by the Cleaners, emissaries of a neutral power force that "cleans up" the mess caused when mortals are accidentally exposed to magic. In their efforts to erase Wyatt's existence, the Cleaners also wipe out the short-term memories of Piper and her sisters, Phoebe (Alyssa Milano) and Paige (Rose McGowan). Elsewhere, Phoebe continues to have problems with her new empath powers; Paige doesn't know what she's unleashing when she uses magic as a defense mechanism against sexual harassment at the workplace; and Leo sends novice Whitelighter Chris (Drew Fuller) on an intriguing new assignment. ~ Hal Erickson, Rovi