Reeling from the deaths of their respective sisters, Piper, Billie and a returned Leo enlist Coop's help to go back in time and prevent all the misguided bloodshed. This forces Billie to realize just what her sister had truly become. The future versions of Chris and Wyatt also make a helpful appearance. When everything is said and done, the Charmed Ones are left to reflect on all they've experienced during their time together.
Episode number: 8x22 Production Number: 62015-08-178 Airdate: Sunday May 21st, 2006