what going on?

Charmed 1x7

The Fourth Sister

A troubled teenage girl befriends Phoebe with the hopes of joining the Halliwells, but she’s been lured to the dark powers of witchcraft by a sorceress. Meanwhile, Prue tries to find time with Andy and Phoebe and Piper vie for the attention of Leo.

Charmed: S01E07
Nov. 18, 1998

Charmed season 1