Complete story — includes the ending
Prue and Piper bring a doctor to the manor, to protect him from a powerful demonic assassin named Shax, who was sent by The Source. When Shax breaks into the manor, he throws Prue and Piper through a wall, causing them to almost die, until Leo arrives with enough time to heal them. Phoebe uses a vanquishing spell on Shax but it does not kill him. While searching for Shax out in the streets, Prue and Piper are caught on live television using their powers, thus exposing themselves as witches. Phoebe goes to the Underworld to find Cole and while there, they are forced to strike a deal with Tempus to travel back in time to before it was revealed that magic existed. They travel back successfully but Phoebe, Cole, and Leo are now trapped in the Underworld, leaving Prue and Piper lying unconscious on the floor from when Shax blasted them in his initial attack.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Charmed season 3. HTML formatting and reference markers removed. · Content license