Charmed Season 7 Episode 18 : Little Box of Horrors

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.