Paige tries on a pair of her grandmother's old go-go boots, and finds herself transported back to the 1960's. While there, she meets a younger hippie version of Grams, who is obsessed with ridding the world of evil through the power of love. Piper and Phoebe go back to make sure she doesn't alter the timeline. In the present, Leo, Chris, and the spirit of Grams battle a slime that consumes all magic around it.
The three Halliwell sisters have accepted their destiny of protecting the innocent and vanquishing evil doers, even though that is generally not on the agenda of every twenty-something on the fast track to discovering what life's all about.
Prue, the oldest, is driven to succeed and dislikes the free-spirited antics of the youngest sister Phoebe. Piper, the earthy middle sister, mediates between her siblings. Prue has the power to move objects, Piper to freeze time and Phoebe to see the future. In the fourth season, Prue died and was replaced by Paige, a half sister, who has the power to move objects and orb (teleport).
The sisters must band together to protect themselves, and the world, from the dark, demonic forces that seek to destroy them.