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.
When a person who was killed right in front of Phoebe comes back from the dead to blame her, she becomes guilt-ridden and vulnerable, creating an opportunity for Zankou to steal the Book of Shadows. Meanwhile, Paige has a new charge who knows nothing about magic, and Piper and Leo attempt to plan Chris's first birthday party.
Unbeknownst to the sisters, baby Wyatt's new ""imaginary"" friend is actually a demon named Vicus who is trying to win Wyatt's trust to turn him evil. Meanwhile, Piper casts a spell to be able to understand baby Wyatt, but inadvertently brings 25-year-old Wyatt back from the future.
A powerful sorceress switches bodies with Phoebe, who ends up trapped in the Underworld. Meanwhile, Paige faces a big problem when her new charge refuses her help.
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.
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.
Piper is attacked by demons and winds up in a coma, and as she hovers between life and death, her spirit meets a familiar face who wants to help restore Phoebe's faith in love. Phoebe, Drake & Paige rush to save Piper by attempting to locate Leo, who's memory has been wiped clean by the Elders in attempt to allow him to choose his own destiny: be an Elder forever or choose Piper, and become mortal.
When Daryll's friend is possessed by the spirit of an innocent killed in a fire in 1899, Phoebe and Drake transport themselves back in time to the caberet where it happened. However things go from bad to worse, when they find they cannot travel back to their own time. Meanwhile, Piper convinces Leo they need to take a family vacation.
When Paige tries to hire a new professor for the Magic School, one of the candidates, Drake, turns out to be an ex-demon who made a deal with a sorcerer to become human. Meanwhile, Leo faces the Elders.
Leo discovers that the Charmed Ones' conflict-free world comes with a higher price than anticipated, so he must join Zankou to stop the Avatars and reverse the change.
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.
When Piper switches powers with Phoebe, to allow her to see the vision of the utopian world, Zankou interferes, and causes their powers to be transferred to innocent bystanders, who run amok. Meanwhile, Brody's murderious desires prompt Paige to take him on a journey back to his childhood to learn the truth about his parents' death.
The Avatars enlist Leo to protect the Seer because she has information that could help them destroy the demons. Meanwhile, Brody reveals a secret to Paige, and Phoebe and Darryl continue to investigate Brody.
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.
Paige and Agent Brody, are drawn into an unfinished novel that takes place in the 1930s, and they must elude the gangsters in pursuit of the famed Burmese falcon. Meanwhile, Phoebe, Piper and Leo work to re-write the novel to help get Paige and Brody out of it, before they're killed.
Agent Brody and Paige investigate when they discover that the demon Sarpedon is capturing innocents' guardian angels and using them to protect himself from the new power. Meanwhile, Piper and Phoebe encourage Leo to go on a vision quest to face his demons.
When a blue moon causes amok at the same time the girls are assigned a new whitelighter, thanks to the Elder's suspicion of Leo, trouble brews. Meanwhile, Agent Brody tells Paige of a powerful new threat, and Phoebe & Leslie confess their true feelings for each other as Leslie prepares to leave.
In an attempt to stop a demon on a murderous rampage upon his human relatives, Paige casts a spell that inadvertently blocks all death, and it's up to the Charmed Ones to make things right, when the Angel of Death wants the mess cleaned up. Meanwhile, Agent Brody reveals that he has been following the Halliwells longer than they thought, and Phoebe must deal with her feelings toward Leslie.
When Paige encounters Captain Black Jack Cutting, an 18th century pirate in search of the Fountain of Youth, the curse on his life becomes her problem. Meanwhile, Leslie manipulates a contest in order to spend time with Phoebe, Leo fights with the creature that caused him to kill an Elder, and a mysterious federal agent comes to town to investigate the Halliwells.
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.
The Charmed Ones have their hands full, when thanks to a bored Magic School student, they must keep Lord Dyson from killing the infamous Lady Godiva before she can travel back in time and complete her famous ride. Meanwhile, Phoebe has reservations about Les being able to properly write an advice column for women.
A grief-stricken Piper and Leo attend a Hindu wedding, where they inadvertently receive the powers of Hindu gods, and it's up to Phoebe and Paige to keep them from consummating their love in order to save the universe.
