A warlock from the past is released from his curse and tries to steal the sisters' powers with the help of Rex and Hannah, but the sisters resurrect their ancestor to combat him. Meanwhile, Piper works up her courage to ask Leo out and Andy gets frustrated by Prue's continued involvement with bizarre police investigations.

When Prue is framed for stealing from the auction house and arrested, it is revealed that her boss, Rex, is a warlock. It's up to Piper and Phoebe to prove Prue's innocence and vanquish Rex before its too late.

A powerful warlock shows up claiming that he made a pact with the sisters' mother in which he spared her life in exchange for the girls' powers. Fleeing him, the three sisters go back in time to the 1970s when their mother was still alive and they try to prevent the pact.

A band of knowledge-stealing warlocks hunt down a young man who uncovered the location of one of the greatest sources of power in the world. Meanwhile, Prue has her hands full with Jack Sheridan.

An assassination attempt on the sisters' lives forces Prue to go undercover as the woman who tried to kill them, known as Ms. Hellfire. While undercover, she becomes romantically involved with the man who hired the original Ms. Hellfire.

Phoebe helps Piper cast a spell in order to help her choose between Dan and Leo. Meanwhile, Bane is broken out of jail and kidnaps Prue.

When a vanquishing spell goes awry while the Halliwells try to destroy the 4 Horsemen of the Apocalypse, Prue and one of the Horsemen become trapped in a vortex. Piper and Phoebe enlist the help of the three remaining Horsemen to free Prue and the fourth Horseman before the vortex closes, and both are killed.

On Halloween, the sisters are pulled back in time to the 1600's to save a witch and her soon-to-be-born child from the hands of an evil witch who wants to raise the child evil. The sisters later discover that this situation may have more personal implications than they first imagined.

When Prue discovers that her ex-boyfriend is being led down the path to becoming a demon, the sisters must risk their lives in an underworld wrestling ring to save his soul.

Cole poses as Belthazar to infiltrate an internet organization run by evil, that plans on controlling the world's information flow on the internet. Meanwhile, the sisters must vanquish the warlock posing as the company's manager without exposing Cole's role in the situation.