"EXTREME MAKEOVER: HOME EDITION" REBUILDS THE HOME OF A FAMILY WHOSE DAUGHTER RAISES MONEY TO FIGHT CANCER IN HONOR OF HER BEST FRIEND, WHILE BATTLING HER OWN BLOOD DISEASE

David Cook is the "Get on the Bus" Celebrity Volunteer; Xzibit Returns for Second Time to Volunteer

"Cowan Family" -- On October 21, Ty and his team traveled to Bunker Hill, IN -- with singer David Cook as the celebrity volunteer, plus Xzibit volunteering for a second time -- to meet the Cowan family. Andy and Heather Cowan are factory workers who struggle to support their four children, Ryan, 15, Trevor, 13, Mason, 8 and daughter Kori, 12, who is battling a congenital blood disease. This episode of "Extreme Makeover: Home Edition" airs SUNDAY, AUGUST 8 (8:00-9:00 p.m., ET) on ABC. (Rebroadcast: OAD: 1/10/10)

At the age of five, Kori Cowan was diagnosed with a congenital blood disease affecting her immune system. Since then, her parents have made multiple trips every month to Riley Hospital in Indianapolis, where Kori meets with her doctors and receives intravenous blood infusions. Recently Kori started developing polyps in her nasal cavity and behind her eyes. She has already endured 17 operations as a result of these painful growths that have to be surgically removed. Doctors believe the polyps may be the result of environmental issues in the family's home, including an extreme mold infestation. Ryan, the oldest boy, has also fallen ill and gone to live with his biological father - tearing this close-knit family apart.

Despite the daily struggles Kori faces, she has not let her disease slow her down. During one of her stays at the blood clinic, she was inspired by a little girl with whom she shared a room and who remains one of her best friends. Kori has raised over $35,000 for the American Cancer Society in honor of her friend, all the while restricted to the upstairs portion of her deteriorating home. Now it's up to "Extreme Makeover: Home Edition" to build Kori and her family a safe new home that will allow her to not just fight her own disease, but continue to fight cancer as well.

This episode features Ty Pennington, designers Paul DiMeo and Didiayer Snyder, plus David Cook, Xzibit and community volunteers who will rebuild the Cowan home in just seven days.

"Extreme Makeover: Home Edition" is produced by Endemol USA, a division of Endemol Holding. It is executive-produced by Anthony Dominici. David Goldberg is Chairman, Endemol North America. The series is broadcast with Spanish subtitles via secondary closed captioning. This program carries a TV-PG parental guideline.

For more information on "Extreme Makeover: Home Edition," visit ABC.com