Season seven of Charmed begins as benevolent witch Piper Halliwell (Holly Marie Combs) mourns the loss of the "Whitelighter" Chris, whom at the end of the previous season had been revealed to be the future son of Piper and her husband, Leo (Brian Krause). Later in the season, Leo, who has become an Avatar (which may or may not be good news), works overtime to make certain that Wyatt, his other son by Piper, does not fall prey to those demonic forces who are envious of the boy's inbred magical powers. Among the many plot strands this season is one involving government agent Kyle Brody (Kerr Smith), who, while ostensibly assisting Paige (Rose McGowan) in her efforts to track down and neutralize as many demons as possible, drops several hints that he is not all that he seems. In another story arc, Piper, Paige, Phoebe (Alyssa Milano), and the Avatars combine their talents to create a utopia-like state on earth -- but there are unanticipated consequences. The season's conclusion is dictated by the activities of Zankou (Oded Fehr), a previously imprisoned demon who, upon being freed, sets about to destroy the "Charmed Ones" by perverting their witchlike powers, and by stealing those powers for his own nefarious purposes. As the season finale draws to a close, the Halliwell girls arrive at the grim conclusion that the only way to stop Zankou is to sacrifice their own lives.