Britney Spears, Justin Timberlake, Christina Aguilera, Ryan Gosling, Keri Russell and JC Chasez were all discovered as kids by casting director Matt Casella. Chosen from among 100,000 hopefuls, these amazing talents went on to superstardom. But countless others waited for a call back that never came -- until now. Casella has an entire generation of auditions on videotape, and now almost 20 years later we're going to find them and give them that special moment in the spotlight that they've dreamt about since they were kids. Hosted by superstars Donny & Marie, "Rediscovered" airs Tuesday, December 23 at 9:00-10:00 p.m.