Charmed - Season 1 Episode 21 -

Leo is shot by the arrow of darklighter, and ask the sisters to help to protect a girl that is being targeted by the darklighter. Piper casts a spell to swap her powers with Leo's but mistakenly the spell causes Prue and Phoebe's powers to swap. Meanwhile Andy leaves his job to help protect Prue's secret from being exposed by an Internal Affairs investigation.