When the Halliwell sisters are exposed as witches on nation-wide television, they form a pact with The Source to reverse time and undo the damage. However, in the process, one of the sisters makes the ultimate sacrifice, placing the Power of Three in mortal danger.

Piper and Phoebe devise a plan to recover Leo. Meanwhile, Paige rescues her new charge from a Darklighter; Billie is forced to make an important decision.