After the sisters vanquish Shax, The Source of All Evil decides to turn Paige evil instead of killing her. As a result, the Source possesses her boyfriend to see if he can lure her to the dark side. Upon learning of the Source's plan, Piper and Phoebe do their best to track Paige down and convince her to fulfill her destiny to become a Charmed One. As this is occurring, Paige is discovering what her powers can do. Inspector Cortez suspects Piper and Phoebe are behind the deaths of Prue and Dr. Griffiths.

While busy studying the Book of Shadows, Paige shows a large amount of jealously in how adept Phoebe is while performing her martial arts. As a result, when Paige mixes a potion, she accidentally swaps bodies with Phoebe, and while they try to hide the mix-up from Piper, they have a hard time doing so when the sisters have to go help a Zen Master save her kidnapped father from Limbo.