With Maggie trying to make up with Lucy, she realizes that there is a new Kappa member she isn't familiar with and enlists Mel's help to find out what is going on. Macy is concerned about what she saw on Galvin and invites herself to his birthday party to investigate. Meanwhile, Macy is told a cryptic message about her past that she decides to share with her sisters, but her sisters have a secret from her.
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.