Phoebe and Paige search for Leo after Paige accidentally causes a ""chipper"" Piper to have amnesia, but the sisters soon learn he is being held on the mythical Island of Valhalla. Unfortunately they have no idea that it's because of Chris and his mysterious plans. Meanwhile, Phoebe discovers she is now an empath, and the dangers of this newfound power.

At the same time that the Avatars are planning to transform the world into their envisioned utopia, Zankou kidnaps Brody and is forced to cast a paranoia spell on the Halliwell sisters.

The sisters scramble to recover Pandora's Box when it falls into the hands of a shapeshifting demon who intends to open it and fill the world with all of its sorrows. Meanwhile, Paige's Whitelighter side rises to the surface, when she begins hearing calls from the Elders, and Leo and Piper clash over parenting issues - namely raising magical children.