The sisters must find a way to break a curse which turns a man into an Owl by day and his girlfriend into a Wolf by night. Meanwhile, Prue discovers a way to hold Piper and Leo's wedding without The Powers That Be finding out.
Piper has a nightmare with Leo and tells Prue that The Powers That Be have ordered Leo to disappear from her life. Meanwhile Phoebe meets Kate, a young girl that claims that she saved the fairy princess Thistle and now the trolls come in the "tween time" to scare her and capture the fairy. Prue and Phoebe uses magic fairy powder and revert to little girls to see Thistle. Cole Turner visits Phoebe in her house and tries to steal the Book of Shadows disclosing his true appearance, of the demon Belthazor. In the end, Leo returns to Piper telling that The Powers That Be ...
After the manor is burglarized, Prue, Phoebe, and Piper become obsessed with learning more about the elusive evil force that is hunting them. Prue assumes it is demonic, but Darryl cautions them that there is human evil as well.
Phoebe and Piper are on a mission to save Prue after a spell for an innocent horribly backfires and Prue is given the unwanted gift of feeling all the pain in the world. The cacophony of human emotion will most certainly crush her.
After Prue, Phoebe, and Piper learn that Cole is the demon that has been trying to kill them, Phoebe faces the tough decision of killing the man she loves or defying her sisters by letting him go free.
Piper is consumed with insecurities over her impending 10-year high school reunion, but when a she-demon unexpectedly takes possession, Piper becomes very "Coyote Ugly" and it is up to Prue and Phoebe to bring her back.
Prue has a melody in her head and when she sees a girl humming the tune, she finds that it belongs to the ice-cream truck. Prue and Phoebe follow the girl and the trio is sucked by a vortex inside the van. They find a playground in the middle of the snow and several children hiding from The Nothing. They rescue the children and once back in San Francisco, they realize that they are demon children. Meanwhile, their father Victor Bennett returns and helps his daughters to fix the situation, capturing the dangerous demons and sending them back to The Nothing.
The sisters must stop a warlock from executing his plan to steal specific powers from witches in his attempt to kill every whitelighter in the world. Meanwhile, the girls get a new whitelighter named Natalie.
Phoebe somehow becomes psychically and physically linked with the violent past of an Old West ghost town complete with horses, petticoats, cowboys and six-shooters and Prue must go back in time to save her sister from a horrifying fate.
Piper is praying for a demon-free wedding day, but Prue's astral self has other plans as dreams take her into a wild world without rules and responsibility that affect reality when the police arrest Prue on suspicion of murder.
Prue is tired of losing her battle to save innocents, and in her effort to fight off the Angel of Death, she has to turn her back on a dying soul when she accepts that she can't fight fate and reconciles with the death of her mother.
Piper and Leo feel lack of privacy and decide to move to a rented apartment. When they tell Prue and Phoebe, the Halliwell sisters recall their troubled relationship with their grandmother Penny before they acknowledge that they were The Charmed Ones. Meanwhile an evil warlock and former cat forces the sisters to kill him nine times to leave definitely his past life as a cat and transform in a warlock forever.
Cole officially joins the good fight when he goes undercover in an underworld brotherhood to help Prue, Phoebe, Piper, and Leo learn more about the evil. Their trust in him falters when it looks as though they are being double-crossed.
Phoebe is worried when her love, Cole stays undercover in a demon Brotherhood, but the danger turns dire when Cole's old mentor plots to bring out his evil side and turn his massive powers against the Charmed Ones.
Piper is trying to control her new power, while Phoebe is writing in the Book of Shadows about Cole. Prue is worried with the behavior of Phoebe and also missing a nice boyfriend. When a Banshee - an evil witch that kills those in pain and misery with her sharp scream and is only detected by dogs - attacks a neighbor of The Charmed Ones and Phoebe has a premonition with her next victim, Prue decides to cast a spell to track the Banshee. However, she is transformed in a dog and later she is hit by a car. Meanwhile Phoebes is in pain because of her love for Cole and is ...
Prue and Piper bring Dr. Griffiths to their home to save him from the Source's assassin Shax. While Phoebe looks in the Book of Shadows how to vanquish the demon, Prue and Piper fight and chase Shax onto the streets to destroy him. However, they are filmed and exposed live on television news as witches. They become a national sensation with a crowd in front of their house. Phoebe trusts Cole and goes to the underworld with Leo to ask him to summon Tempus and revert time while a fanatic woman shoots Piper, who dies. The source proposes Phoebe to stay with him and in ...