After some unusual seismic activity, Harry informs the sisters that Hilltowne is a portal to hell. With that said, the sisters must band together to fight off a shadowy demon that is trying to obtain a collection of powerful magical artifacts. Meanwhile, Macy is given an exciting opportunity at work which comes with unexpected complications. Lastly, Maggie has a conflict of conscience over her relationship with Parker.
Three months after their mother is killed by an unknown demonic force, sisters Mel and Maggie discover that they have an older half-sister, Macy. The first time the sisters are under the same roof, they unexpectedly start exhibiting new magical abilities; the eldest Macy receives the power of telekinesis, middle sister Mel can freeze time, and the youngest Maggie can hear people's thoughts.
Soon after, Harry Greenwood gathers all three sisters together and reveals to them that they are witches, as was their mother. Marisol had bound her daughters' powers when they were born so they could live normal lives, and was in the process of unbinding those powers on the night she was murdered.
The sisters ultimately accept their new destiny as The Charmed Ones, the most powerful trio of witches who protect innocents and vanquish supernatural demons.