Ten contestants are left in this compelling weight-loss drama in which two celebrity fitness trainers join with top health experts to help overweight contestants transform their bodies, health and ultimately, their lives. Caroline Rhea ("Sabrina, The Teenage Witch") hosts the unscripted, one-hour series in which two competing teams follow comprehensive diet and exercise plans to undergo radical physical makeovers. In this episode, the red and blue teams take the stage for a lively "popstar" challenge, where the teams have to write and perform a song about their weight struggles in front of a live audience.