S1, E21: White-Lighter Leo returns to help rescue Daisy, a young woman on her way to becoming a White Lighter, he's injured by the evil Alex, who once loved and is now out to get Daisy. Turning to the sisters for help, he realizes he's still in love with Piper. To save him, Piper casts a spell to switch powers with him and give herself the healing gift, only switching Prue and Phoebe's powers with one another. Meanwhile, Trudeau endures further scrutiny from mercurial IA Investigator Rodriquez.