Paige inadvertently causes Piper to lose her memory, and she and Phoebe set out to find Leo. They find out he's being held on the island of Valhalla, but aren't aware that Chris is involved, and disguise themselves as Valkyries to infiltrate the island. Meanwhile, Phoebe must contend with the dangers of becoming an empath.
Wyatt accidentally summons a dragon, and The Cleaners kidnap him and erase him from existence. Paige, Phoebe, and Piper regain their memories and try to remember the details of Wyatt's kidnapping. Meanwhile, Phoebe struggles with her new powers and Chris takes on a new duty, while Paige is caught in a sexual harrassment problem.
When Piper, Paige, and Phoebe find their powers stolen by three evil sisters, they are forced to try and make Chris realize they are the real Charmed Ones. Meanwhile, Leo continues to search for the identity of whoever placed him on Valhalla.
Paige falls in love only to learn that the object of her interest is part of a family with magical powers that has been feuding with another magical family. The Halliwell sisters all end up involved in the feud, with Paige becoming an unfortunate conduit for Richard's dead lover. Meanwhile, Leo learns that Chris has sought out an elixir within the underworld.
The sisters find themselves in a magical reality which taps into their hidden desires, from which they must escape. Meanwhile, Leo wants the elders to take away Chris' whitelighter role.
Paige learns her boss has traded his soul for a great career, and tries to get it back. Phoebe takes on a new writing partner, while Piper discovers that Wyatt has been working to ruin her dating life. Meanwhile, Leo and Chris inadvertently head back in time.
The Lady of the Lake comes to the Charmed Ones for help in protecting the sword in the stone, Excalibur. Although many have come forward to try and and pull the sword out of the stone, Piper is the only one who manages to successfully do so.
Paige, Piper, and Phoebe become foster parents to a half-demon baby when they destroy its demon mother. Chris suggests they also destroy the baby, but the sisters begin to believe that the baby can become a good if raised with tender care. Meanwhile, Paige gives Darryl a new power, while Phoebe inadvertently lets Jason know how she feels about him.
An assassin named Bianca comes from the future to steal Chris' powers. Meanwhile, Phoebe conisders going to Hong Kong to be with Jason, while Paige makes a decision to live with Richard.
When Paige ends up back in an earlier era when magic and love were free and loose, she comes upon Grams and learns that she attempted to spread the word of love's potency to try and destroy the planet's evil.
Piper decides she needs to focus all her energy on Wyatt, but Paige and Phoebe summon a real catch for Piper to show her why it would be a bad idea to abandon romances with men permanently. Chris manages to get Wyatt's powers temporarily curtailed to keep him safe from evil influences, but the result is that Wyatt is unable to stop the kidnapping advances of a cult.
Jason leaves Phoebe when he discovers the three sisters are witches. Richard tries to get out from the under his heritage of bad karma, but his attempt channels the spirit of Mata Hari into Phoebe, which plants the seeds of revenge against Jason in Phoebe. Meanwhile, Paige, and Piper continue to take down Swarm demons to eliminate threats to Wyatt.
Leo's magic school mentor requests the Halliwell sisters' help in finding the culprit who cast the dark spell which summoned the Headless Horseman, who has been chopping the heads of the faculty. Meanwhile, Phoebe takes a vision quest into the future and learns more about Chris.
A genie named Jinny manages to convince Phoebe to let her out, and Phoebe herself soon becomes the genie trapped in a bottle. As the new wishgiver, Phoebe ends up botching Chris' wish to get Leo and Piper together and finds herself the receipient of another wish from a desperate Richard, who is looking to reconnect with Paige.
Piper and Leo are accidentally sent to another plane of existence which leads Paige and Phoebe to think they have died, all the while unaware that Gideon had an agreement with the Darklighters to help get rid of Leo. Meanwhile, Chris informs everyone that he is beginning to vanish, and must be conceived by midnight if he is to remain intact.
Phoebe accidentally puts a spell on herself while readying for her big high school reunion which reverts her back to her wild teenage mindset, but at the event, the wiley leader of her old crew wants to exploit her behavior, along with her magic powers, to pull an armored car heist. Meanwhile, Piper and her father try to determine the reason for Chris' growing lack of interest in her.
The gang tries to rescue Piper from a venomous Spider Demon which has come out of a century-long nap to feast. Chris is bitten by the spider and begins to turn into a spider, himself, and Paige soon decides to recruit her forest friends to help save Piper and Chris.
Darryl becomes a scapegoat for murder after Paige and Phoebe are accidentally caught on tape using their magic in plain sight. When the two Halliwell sisters convene a council trial to help set him free, the tables are turned and soon the sisters are the ones on trial for recklessly using their magic. Leo and Chris must then attempt to rescue them all from a terrible fate.
While Paige tries to compensate for the absence of Phoebe and Piper's lack of powers, she inadvertently conjures up Mr. Wrong, the sinister twin of Mr.
Gideon uses the help of a pair of demons to make the Halliwell sisters demon prey on his new reality show "Witch Wars," an attempt to veil his efforts to find baby Wyatt. Meanwhile, Chris gives the sisters a message about his impending birth.
Gideon pretends to return Chris to the future, but sends him, along with Leo, to a similar world which is ruled by evil forces. Phoebe and Paige attempt to rescue the two, but soon come face to face with their evil mirrors. Their trip has unforseen consequences for the regular world, and leaves Baby Wyatt unguarded against Gideon.
Paige and Phoebe return to their normal world and find that the world is now skewed towards absolute good, but for the worse. When Gideon takes advantage of Phoebe's newly-acquired memory lapse to use her magic against the other sisters, Chris and Leo must help rid the sisters of Gideon's meddling presence once and for all. With all restored and Gideon vanquished, at long last, Chris is born to Piper.