Be Careful What You Witch For

S2 E22: A Genie, employed by a Dragon Warlock to steal the Halliwells' powers, offers to grant each sister one wish for whatever they most desire. But when they refuse, the genie tricks them into wishing, resulting in an uncontrollable power for Phoebe, Prue's death, and the rapid aging of Dan, who finally learns Piper's secret.