The sisters learn Leo is being held captive on the Island of Valhalla and must disguise themselves as Valkyries to rescue him.
Paige takes a job as a dog walker and is amazed when one of the dogs turns into a man.
The Cleaners (Kirk B.R. Woller and Darin Cooper) take Wyatt and erase all memory of him; Phoebe's lack of control over her new empathic power makes her start a barroom brawl.
Three evil sisters steal the Charmed Ones' identities and powers; Paige realizes magic will always be a part of her life; Leo tries to find out who put him on the Island of Valhalla.
When the sisters hold a seance, they contact a vengeful ghost who has been fomenting trouble between families.
A demon (Desmond Askew) taps into the sisters' secret desires to create an alternate reality; Leo convenes the Elders to strip Chris of his Whitelighter status.
Paige discovers her new boss has swapped his soul for a successful career; Wyatt sabotages Piper's dates; Chris and Leo travel back in time.
When the Lady of the Lake appears before the Charmed Ones and pleads for help to protect the legendary Sword in the Stone, Piper comes forward and pulls the sword free.
A mysterious woman from the future (Marisol Nichols) arrives to take Chris' powers; the Power of Three is endangered when Paige moves in with Richard and Phoebe joins Jason in Hong Kong.
Paige tries on a pair of Grams' go-go boots and goes back in time; Leo and Chris try to stave off an amorphous creature surrounding the manor.
A withered old woman (Grace Zabriskie) deprives the sisters of their senses in an effort to steal Piper's baby, Wyatt.
The Halliwell matriarchs gather to bless baby Wyatt; Paige casts a truth spell to see if her boyfriend can handle her secret life.
Leo turns the sisters into Greek goddesses so they will be able to vanquish mythic giants; Piper's life is turned upside down when Leo accepts the call to become leader of the Elders.