“The Power of Three.” That represents the combined powers of “The Charmed Ones,” a trio of sisters and the most powerful good witches of all time. Audiences were first introduced to them in the fantasy drama series Charmed, which ran on the young-adult-oriented WB network and quickly became a hit with the target audience and genre fans. It’s a fandom that endures even today, years after the series wrapped up its run in 2006.