A warlock repeatedly attempts to kill the Charmed Ones, with a help from demon Tempus turning back time after each failure so that he can try again. However, because of the endless time loop and her power of premonition, Phoebe experiences a number of strong cases of déjà vu and is able to figure out that there are evil forces after them.

A powerful warlock shows up claiming that he made a pact with the sisters' mother in which he spared her life in exchange for the girls' powers. Fleeing him, the three sisters go back in time to the 1970s when their mother was still alive and they try to prevent the pact.

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.

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.

Piper falls for the ghost of a recently murdered man who needs her help. Meanwhile, Phoebe works as a psychic to help others and make money for Prue's birthday present, and Prue discovers a devastating betrayal.

The sisters are about to go on a relaxing weekend getaway to Cabo, when a mortally wounded Leo shows up and asks for their help to save a young woman who's being chased by a darklighter. Desperate to save Leo, Piper casts a spell that swaps their powers, however in doing so, she accidentally swaps the powers of Prue and Phoebe as well. Meanwhile, pressed by an Internal Affairs investigation Andy decides to leave his job in order to protect Prue's secret from being exposed.

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.

The sisters' mother warns them about a demon from the underworld who comes around every 1300 years on Friday the 13th to literally scare witches to death and feed on their fear. Meanwhile, Phoebe has misgivings about her expected duties at her new job and Piper is frustrated by her superstition about relationships started on Friday the 13th.

When Phoebe has a premonition of Prue being stabbed to death, it coincides with a warrior coming to town in order to kill the eldest sibling witch as he did to the sisters' great-great-great-aunt.

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.

Three sisters reunite after the death of their beloved grandmother, and learn they have inherited much more than the family manor.

A warlock from the past is released from his curse and tries to steal the sisters' powers with the help of Rex and Hannah, but the sisters resurrect their ancestor to combat him. Meanwhile, Piper works up her courage to ask Leo out and Andy gets frustrated by Prue's continued involvement with bizarre police investigations.

Phoebe's fear of the Woogyman amuses Prue and Piper, until an earthquake releases a shadow demon. Phoebe under the control of the Woogyman tries to kill Prue and Piper, who must find a way to rescue Phoebe and get rid of the Woogyman.

When Prue witnesses and tries to stop a kidnapping of a young boy in the park, a reporter sees her using her powers. He tries to blackmail her to get a sensational story for his newspaper. Phoebe and Piper attempt to learn more about the demons who stole the child and come across a similar kidnapping that happened 20 years ago. Meanwhile, Andy gets involved in the kidnapping case and finally confirms his suspicions about Prue's powers.

When Phoebe has a vision of herself being burnt to death, the sisters travel ten years into the future to learn what happened. Only to discover that she used her powers to kill someone, causing a local DA to begin modern day witch trials as a platform for political office. Meanwhile, Prue and Piper try to save Phoebe, but they both are surprised and somewhat disappointed to learn how their lives turned out.

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.

Acting on Phoebe's premonitions, the sisters race to stop a mysterious killer from striking again. Meanwhile, Prue finds a truth spell and uses it to find out what Andy's reaction to her being a witch would be.

When Prue is framed for stealing from the auction house and arrested, it is revealed that her boss, Rex, is a warlock. It's up to Piper and Phoebe to prove Prue's innocence and vanquish Rex before its too late.

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.

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.

After Piper leaves on a business trip, it doesn't take long for some friction to appear between Prue and Phoebe. However, they set their differences aside when they run into a ghost of a serial killer who's looking for a revenge against people who sentenced him with a death penalty. Meanwhile, the many unsolved crime cases are finally starting to catch up with Andy when people from Internal Affairs take an interest in them.

When the sisters discover that Cole is Belthazor, Phoebe must make one of the toughest decisions of her life: either vanquish her boyfriend or keep one of the most dangerous demons known to exist alive.

When a shapeshifting warlock tricks Prue into a shot-gun wedding in order to steal the Book of Shadows, Phoebe and Piper are lured to the dark side and begin to enjoy their new evil powers.