Transcript for A look back at superstars who got their start on 'American Idol'
and the wait is almost over. "American idol" returns this Sunday. Of course, thehow has helped launch so many incredible careers from Kelly Clarkson to Jennifer Hudson and Carrie Underwood. ABC's Chris Connelly is joining us from Los Angeles, and Chris, a lot of excitement surrounding "Idol." Reporter: Indeed, Amy. Good morning. Along with the drama of the competition, and the sizzle-icious opinions of the judges, people have started remarkable careers, and what they have turned out to be. Who will become the next "American idol"? Reporter: Starting in 2002 with its first winner, Kelly Clarkson. Kelly Clarkson. Reporter: "American idol" has given viewers some singular moments while launching some singing megastars. ??? How do you expect me to live alone ??? Carrie Underwood. Reporter: We saw her and her soaring voice winning America's heart. When she became a country music sensation ??? maybe next time he'll think before he cheats ??? Reporter: And a seven-time grammy recipient. Speaking of award -- Jennifer Hudson may not have won the 2002 competition, she came in seventh, but she won an Oscar for "Dream girls." ??? You're going to love me ??? Reporter: From the shimmering Katherine Mcphee, Kellie Pickl pickler, they got show biz faces while singing their faces out eager for the big break. Let's not forget the fellas. Who could forget him? Aside from William hung, "American idol" fans encountered Adam lambert's vocal greatness back in 2009. He has gone on to tour with quee queen. And from Reuben Stoddard to clay Aiken. Could the next Jordin sparks be in the wait? Might we see a broadway-bound voice like the level of fan Tay Sha. ??? Reporter: You will have to lost because finding unknowns and taking vocal diamonds out of the rough and onto the biggest stage, there is nothing quite like "American idol." ??? Because I want to make you feel ??? You are not going to Hollywood. Reporter: So you might be watching a future superstar just getting started, toer you might watch someone who will never sing in public again. That's the fun part, and that's why we watch, Amy. I'm a huge fan, and I'm a huge fan of sizzle lishs. That made my Friday. The journey begins on "American idol" this Sunday at 8:00, 7:00 central right here on ABC.
This transcript has been automatically generated and may not be 100% accurate.