Paige accompanies PhoebeÝ to her high school reunion. Phoebe (when in high school) was mischievous girl and was always into trouble. Members of Phoebe's old gang are there: Ramona, the one who used to do everything Phoebe asked; Todd, Phoebe's old flame. The only one missing is Rick, the old gang leader, because he's been arrested and is in County Jail.
During the reunion, Phoebe starts to not feel right, she exits the gym followed by Paige. She suddendly morphs into Teen Phoebe: long hair, 90s clothes, ready to battle. Bored from the reunion, Phoebe casts a spell so everyone acts as their teenager selves.
Elsewhere, a wild adventure awaits the old gang which includes borrowing a cop's car, and visiting their old gang leader who's now in prison... breaking him out and pulling a few other pranks? But Rick as plans of his own.
original airdate--March 14,2004 rating--4.8 million
music--Charmed Theme song--"How Soon is Now" by Love Spit Love
Trivia: The title makes reference to the novel "The Strange Case of Dr Jekyll and Mr Hyde" by Robert Louis Stevenson.