The Charmed Ones are called upon by The Lady of the Lake to help protect Excalibur, the legendary Sword in the Stone. Meanwhile, numerous magical beings arrive at the manor to try their hand at pulling the sword from the stone, but it's Piper who finally pulls Excalibur out of the stone, causing a surprise figure to appear.

When Piper is kidnapped and cocooned by the Spider Demon, and becomes Chris infected with the Demon's venom, causing him to mutate into a spider, Paige, Phoebe and Leo try to rescue them. Meanwhile, Leo finally learns why Chris resents him.

When the sisters try to divert Zankou's attention from the Nexus, he hatches a plan to absorb all their powers. But when the girls realize what Zankou is up to, they are forced with a life-altering decision: sacrifice their powers or their lives.

Phoebe, in an attempt to move on with her own life, signs a lease for a new apartment, and Paige considers moving in with Henry. However the sisters are forced to remain under the same roof when a demon shrinks them and traps them in a replica dollhouse of the Manor.

In an attempt to destroy the reputation of the Charmed Ones, Billie & Christy resort to trying to make the magical community see that the Halliwells only care about themselves. Meanwhile, Phoebe begins to lust after Coop; Paige cannot hear her charges' call for help; Piper becomes the perfect 1950s housewife.