Claim to fame: Race car driver, Season 5 champ
Last seen on: Season 5 in 2007
Standout moment: Castroneves and partner Julianne Hough, above, wowed the audience with a high-scoring mambo (27 out of 30 points from the judges), making the racer an early favorite. Hough received an Emmy nomination for the upbeat dance.
Week 3 All-Star elimination:The three-time Indianapolis 500 winner made a fatal mistake by tripping over partner Chelsie Hightower during their quickstep, which still earned them 25.5 points. He managed to keep his mega-watt smile, good humor and gratitude on throughout, saying thanks to Team Penske, his partner and to America. | Recap A.J. Mast / Associated Press