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.

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.

The sisters must face and destroy the demon that was responsible for their mother's death 20 years ago. In the process, they uncover a chapter of their mother's life that they never knew about - one that disturbingly mirrors Piper's current relationship with Leo.

After Prue prevents a woman from committing suicide, a Darklighter puts a curse on her that throws her into a depression that could cost her life.

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.

Phoebe has a premonition of a murderous banshee while adding on to the Belthazar section of the Book of Shadows, thus causing her to think Cole is responsible. But when the sisters cast a spell it backfires and turns Prue into a dog, and when Prue gets hit by a car, Phoebe's remorse causes the banshee to attack her, turning her into a banshee.

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.

When two ghosts from Leo's past return to seek revenge, Leo faces his demons by submitting, causing Piper's life to be threatened,leaving Paige to deal with the situation. Meanwhile, Cole tries to convince Phoebe they need a home of their own.

When Phoebe must constantly save the life of her new boyfriend, a warlock shows up from the future, claiming that future Cole sent him in order to kill the boyfriend before Phoebe's dies instead. However, present Cole cannot allow this and tries to help the sisters protect Miles, but when the warlock decides to work on his own agenda, by stealing the Book of Shadows, it results in the death of two of the Halliwell sisters. The survivor must decide whether going back to change the past is the right thing to do.

When three evil sisters magically steal the Charmed Ones' identities and powers, Piper, Phoebe and Paige must convince Chris that they are the real Charmed Ones in order to get their lives back. Meanwhile, Piper realizes that Wyatt needs time with Leo, who continues on his quest to find out who put him on the Island of Valhalla.