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Charmed, season 4 episode 4 «Enter the Demon»: air date October 18, 2001. Episode overview, season trailer and the cast of Charmed.
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.