 The alchemist demon Kierkan tries to capture the essence of life of his creation, the she-demon Terra, and trap her in a bottle. However the evil spirit escapes, possesses a human and tries to find and possess one of the Charmed sisters to become powerful and vanquish Kierkan. Meanwhile, Piper is nervous, preparing for the celebration of her 10-year high school graduation, with the reunion of her schoolmates in P3. Phoebe is missing Cole, and researching his family. Terra possesses Piper, and when Prue discloses, she plots a mortal plan to save the life of Piper and vanquish the fiend.