Forced to hide from Billie and Christy, the Charmed Ones find themselves stuck in the Underworld. Meanwhile, Leo appears to Piper and offers demonic approval; Coop searches for Phoebe; Billie & Christy resort to summoning the Hollow to stop the Charmed Ones and the Charmed Ones do the same.
Elenco: Holly Marie Combs , Alyssa Milano , Rose McGowan , Brian Krause , Kaley Cuoco , Alyssa Milano , Dorian Gregory , Drew Fuller , Jason Lewis , Kaley Cuoco , Ashley Tisdale , Eric Dane , Finola Hughes , Greg Vaughan , Ivan Sergei , James Read , Jennifer Rhodes , Kerr Smith , Nick Lachey , Theodore William King .