The Witch Is Back

S1, E9: After Rex gets Prue a locket that harbors the evil warlock Matthew, Matthew takes Prue's powers and sets out for the other sisters. The sisters Halliwell fight back and conjure up their witchly ancestor Melinda Warren to combat the evil demon. Meanwhile, Matthew sets out after Halliwells in the phone book in an effort to locate Piper and Phoebe.