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Forsworn to destroy the Halliwell girls, the evil spirit Terra (Paige Rowland) goes about her business by entering the bodies of innocent mortals, killing them one by one after they have served their purpose. Meanwhile, the P3 club becomes the site of Piper's ten-year high school reunion -- an occasion of great anxiety for Piper (Holly Marie Combs), who was far from her school's prettiest and most popular student. Inevitably, Terra shows up at the reunion and enters Piper's body -- whereupon Prue (Shannen Doherty) and Phoebe (Alyssa Milano) must figure out a way to vanquish the malevolent spirit without killing their own sister!