TRIVIA: This episode features the first spell ever used and it is performed by an unknown witch. It goes: "Ancient one of the earth so deep, master of moon and sun. I shield you in my Wiccan way, here in my circle round, asking you to protect this space, and offer your sun force down". In the Charmed paperback novel called "The Power Of Three" however, this witch was named Serena Fredrick. Events in this book and TV episode are basically the same.