The Secret Circle

After Diana introduces Cassie to other members of the circle, they reveal themselves as witches, and that she is one as well. Initially, Cassie refuses to believe them - until Adam shows her how to unlock her magical powers. After Cassie reluctantly joins the circle, Adam, Diana, Faye, and the other members of the coven quickly discover that with Cassie in their circle, they are able to cast spells more powerful than they ever could before.