After kidnapping Phoebe, Cole sends a shapeshifter to assume Phoebe's identity to help him manipulate Piper and Paige into giving him ownership of the Manor, allowing him access to the powerful Nexus located beneath the house. Meanwhile, Phoebe plans her escape, and Cole gets Paige arrested and ensures that Piper's club fails to pass health inspections in order to keep them distracted.

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.

With Piper away at magic school and Phoebe without her active powers, overworked Paige conjures Mr. Right for stress relief but, unknowingly, releases his evil twin, Mr. Wrong.

When Paige and Phoebe summon Grams for Chris's wiccaning, Grams puts a spell on the children to try to end their sibling rivalry, but instead it reverts the sisters back to bickering teenagers. Meanwhile Phoebe, still acting like a teenager, attends an award ceremony with Les, and Leo consults a demonic seer to find out who is behind the attack on Wyatt.

Piper learns Leo is an Avatar, when he confesses to her, despite the objections of the other Avatars, who believe Piper should find out on her own. Meanwhile, Phoebe and Paige ask Kyle for help, but his reaction proves disastrous.

In an attempt to lure the sisters out of the manor, Zankou sends his underlings to attack Leo, in order for him to search the house for the Nexus and release the Shadow, the ultimate power. Meanwhile, in order to protect his parents Wyatt magically shrinks them and traps them inside a dollhouse, and Phoebe is left in charge of the newspaper.

When Piper goes for a job interview with a corporate recruiter, she's shocked to learn that the background check of her assumed identity was that of a woman wanted for murder. Meanwhile, Phoebe has a premonition of Dex being in an earthquake.

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.

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.