P3 H2O

Prue traumatized by witnessing her mother's drowning when in elementary school, must face her greatest fear so that the sisters can destroy a water demon when they revisit the youth camp where their mother mysteriously drowned. In the process, they meet a stranger from their mother's past, who turns out to be her former whitelighter, Sam, who they find out was also her secret lover Sam Wilder, who will play a bigger role in the series beginning in season four when he is revealed to be the father of half-sister and half-whitelighter witch Paige Matthews, whose very existence saves the Charmed Ones place in destiny.