When Piper is attacked by a vicious beast, Andy goes on a stakeout with an FBI agent who is hunting the creature. Meanwhile, Prue hires Phoebe to work at the auction house, but Phoebe's vision of a terrible car crash immediately sends her off on a mission to find a long-lost child.

The sisters must find and train the 'Chosen One' to vanquish a powerful evil witch that could destroy the Charmed Ones.

While Piper and Leo are away, Prue and Phoebe must face a series of demons known as Guardians, who protect mortal murderers in exchange for the souls of innocents. After saving Darryl from a Guardian, Prue and Phoebe must testify in court, where they stumble upon an evil conspiracy. Meanwhile, Phoebe falls in love with the new district attorney, Cole Turner.

With Leo as her guide, Paige goes back in time to her teen years, in an attempt to resolve her feelings about the accident that killed her parents. Meanwhile, Piper must prevent ghosts, who have inhabited Phoebe's and Cole's bodies, from fulfilling their mission.

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.

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.

When Piper and Leo begin to have marital problems, Piper casts a spell to allow them to literally see their past together. However, the spell goes awry when Phoebe and Paige are sent back in time to relive Piper's memories, and a warlock bent on destroying the Charmed Ones tags along for the ride.

Phoebe and Paige search for Leo after Paige accidentally causes a ""chipper"" Piper to have amnesia, but the sisters soon learn he is being held on the mythical Island of Valhalla. Unfortunately they have no idea that it's because of Chris and his mysterious plans. Meanwhile, Phoebe discovers she is now an empath, and the dangers of this newfound power.

Phoebe and Paige search for Leo after Paige accidentally causes a ""chipper"" Piper to have amnesia, but the sisters soon learn he is being held on the mythical Island of Valhalla. Unfortunately they have no idea that it's because of Chris and his mysterious plans. Meanwhile, Phoebe discovers she is now an empath, and the dangers of this newfound power.

After vanquishing a Manticore demon, Piper, Phoebe and Paige become foster parents to its orphaned half-breed infant. But when Chris urges the girls to vanquish the child, they believe that if they raise the baby with love, they can change it's destiny. Meanwhile, Phoebe surprises her boyfriend Jason when she blurts out her true feelings, and Paige gives Darryl a superpower.

Gideon creates a portal that puts Chris and Leo in a mirrored world where evil prevails, and Phoebe and Paige travel to the parallel universe to rescue them. Meanwhile, Piper gives birth to baby Chris.

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.

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.

After being presumed dead, the Halliwell sisters begin their demon-free existence with new identities: Phoebe is overwhelmed with visions of her future husband; Paige begins hearing her whitelighter call, which draws her to a mysterious young witch; Piper attempts to deal with her financial situation, the club and her children. Meanwhile, a brash young demon decides that he wants the Halliwell manor as a trophy and plots to kill Victor to get to it.

When her parents come for a visit, Billie accidently transforms them into assassins and also manages to contact a demon who is posing as a human. Meanwhile, Piper attempts to continue her life without Leo; Paige tries to make a connection with Henry; Phoebe tries to find a way to have her own life.

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.