) and the sisters' club and collective identity as the "Power of Three" (P3).
"[S2E8] P3 H2O " refers to the eighth episode of the second season of the supernatural drama series Charmed , which originally aired on December 9, 1999. This pivotal episode explores the sisters' past, specifically the mystery surrounding their mother's death. The title plays on the chemical formula for water ( H2Ocap H sub 2 cap O [S2E8] P3 H2O
: The sisters discover that their mother had a secret, forbidden romantic relationship with her Whitelighter, Sam Wilder . This relationship mirrors the internal conflict Piper feels regarding her love for Leo. ) and the sisters' club and collective identity