Charmed (1998)

S1E9 The Witch Is Back

A warlock, long trapped by a curse, is freed and plots to take the sisters' powers with assistance from Rex and Hannah. In response, the sisters summon their ancestor to help them fight back. At the same time, Piper musters the nerve to ask Leo out on a date, while Andy grows increasingly exasperated by Prue's ongoing entanglements with strange police cases.