Jem is the lead singer for the Holograms, one of the most popular bands in the world. By day, however, she is known as Jerrica Benton, an ordinary girl. She can become a superstar by using the power of Synergy, an incredible holographic synthesizer that makes both light and sound. Although she is famous, Jem is very secretive about her alter ego. She enjoys being both a star and an ordinary girl.