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.

In his twisted attempt to win Phoebe's heart back, Cole casts a spell that alters reality, that eliminates Paige as a Halliwell and destroys the Power of Three. Meanwhile, Paige suddenly finds that her sisters have no knowledge of her existence and that past villians have come back to haunt them.

Phoebe and Paige go to a summit meeting with the leaders of evil and discover that all magic - both good and bad - has disappeared enabling the leaders to steal Piper's about-to-be-born baby and welcome the twice-blessed child into the kingdom of evil.

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 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 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.

When Phoebe must constantly save the life of her new boyfriend, a warlock shows up from the future, claiming that future Cole sent him in order to kill the boyfriend before Phoebe's dies instead. However, present Cole cannot allow this and tries to help the sisters protect Miles, but when the warlock decides to work on his own agenda, by stealing the Book of Shadows, it results in the death of two of the Halliwell sisters. The survivor must decide whether going back to change the past is the right thing to do.

In order to get close to baby Wyatt, the Crone steals one of the senses from each of The Charmed Ones, in an attempt to fool the child.

Piper & Leo, with help from Coop's ring, must travel back in time to change the events that lead to the deaths of Piper's sisters. Meanwhile, Billie uses her power of Projection to do the same thing; many familiar faces gather to help Piper in her time of need.

Barbas, the Demon of Fear, returns and tricks Paige into giving him Cole's powers, and plots revenge on the Halliwell sisters by playing them against their darkest fears.

The Source sends Piper into a deep coma, where she perceives an alternate reality. Phoebe and Paige must find a way to return her to reality and save her from giving up her powers while she is delusional.

Piper, Paige and Leo struggle to convince Phoebe, now a mermaid, to come back to her life as a Charmed One, when she decides to ""swim"" away from her problems with Cole. Meanwhile, Piper casts a spell to stop her panic attacks but instead of facing her fear, she suppresses it, endangering herself and her baby, when a sea Demon comes after her mermaid sister, Phoebe. In order to help Phoebe, Paige takes drastic measures and enlists the aid of Cole, and his newfound demonic powers.

Cole and Phoebe both fall under the spell of the Siren, who lures husbands to her and entrances their wives to follow with the intent to kill, leaving Piper and Paige to figure out how to save Phoebe. Piper, upset with Leo because he does not understand the challenges of being pregnant, and Leo, frustrated that Piper does not realize the demands of being a Whitelighter, have their personas switched magically by their unborn child.

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.

Now all powerful Greek goddesses, the Charmed Ones must try to not be seduced by their new powers and stay focused on vanquishing the Titans before they destroy all the whitelighters. Meanwhile, Leo must decide whether to become an elder or stay with Piper & Wyatt.

Paige finds herself transported back in time to an era of free love and free magic, where she discovers Grams, a peace-loving hippie, who is on a crusade to rid the world of evil through the magical power of love.

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.

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.

When Phoebe feels the pain of an injured American-Indian ghost she sees in a deserted town, Prue travels back in time to the mid-1800s to save the man, and Phoebe, from death at the hands of a local thug.

The Seer plans to steal Phoebe's unborn baby so she can raise the child to become the next Source and prevent the throne from passing on to another demon. Meanwhile, the baby begins to take over control of Phoebe's body, which proves dangerous to Paige.

When the Angel of Destiny offers the sisters a chance to relinquish their powers and lead normal lives as a reward for vanquishing the Source of All Evil, their decision is put on the back burner, while they try and avoid an FBI agent who has them under surveillance and deal with Cole's calls for help, who is trapped in another realm, holding onto his love for Phoebe.

Piper, Phoebe and Paige come to the aid of Mylie, a Mermaid-turned-human, when she shows up looking for their help after a pact she made with an evil Sea Hag begins to go drastically wrong. Meanwhile, Phoebe attempts to divorce Cole, until he shows up claiming to want her back, Paige, attempts to juggle her new position as a full fledged Social Worker, as well as being a Charmed One, and Piper must protect her unborn baby, and face her fear of water.

An evil witch traps the Halliwell sisters in distorted versions of classic fairy tales, where Phoebe attends a ball as Cinderella and meets Prince Charming, Paige has a taste of Snow White's poisoned apple, and Piper encounters a big, bad wolf, as Little Red Riding Hood.

When the mythic Gods, the Titans, are released and kill all the elders, Leo is forced to take over. Meanwhile, a mysterious Whitelighter from the future guides the Charmed Ones when Leo gives the girls the ultimate power to vanquish the Titans, recreating them as Greek Goddesses, despite the risk that they will be seduced by their vast new powers.

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.